Clare has been an incredibly "powerful" (tough) super human child.
When her family was killed and eaten by the first NY in her life, she wasn't scared at all, by the grizzly scene nor her own danger. No, she stayed their unafraid and just cried for her dead beloved family, and was instead merely asked her "brother" (the NY in her brother's appearance) "why?, why?" even as it pounced on her to eat her or to... mate with her. Then, an unknown Claymore shown up and sliced its head open right above-before her eyes, with its blood and brain matter splattering onto her, and it didn't even phase her.
Strangely/unusually, Clare was actually not picked up/taken as the orphan girl to the Org and turned into a Claymore, no, instead she was left as an orphan, and the humans fearing that she may become a NY, had banished her from her own town (just like Raki was as well). So, our little Clare had been somehow amazingly able to live on her own as a "drifter" for an unknown amount of time. Until, she got captured by another NY, and used as its "toy", at least being physically abused if not possibly sexually abused too..., dragged from town to town by-with it.
But then the NY made the mistake to go to the town, that Teresa would be sent to, to kill the NYs there, and it was killed by Teresa, with its body split in half falling to each side of our Clare, with its blood splattering on Clare standing between its severed body. Again our little human Clare is completely unphased by it, not showing any fear what-so-ever during the whole engagement.
Clare was superhumanly perceptive, able to see the real Teresa for who she actually was, saw right through all of Teresa's defenses and saw the Teresa "naked", saw the pain and deadness inside Teresa, Clare saw the real Teresa, Teresa the human being, not Teresa the goddess, not Teresa the Monster, not Teresa the ruthlessly cold and mocking, no, she saw Teresa the human being, she saw Teresa as Teresa.
With a superhuman bravery Clare sought to give Teresa that which she wanted most, to "be human again". Clare saw Teresa as a human being, and treated her as a human being, trying to comfort the pain and deadness inside of Teresa, trying to give her back her human life, and so Clare clung to Teresa, with a stubbornness and determination and resolve to put naruto and ichigo to shame.
Well, our superhuman little Clare, somehow survived 3 kicks by the most powerful being ever in the entire Claymore manga world.
Then, Clare, despite being a little human child, impossibly was able to keep up with Teresa, earning even Teresa's amazement. Our little human child Clare had quite an endurance and stamina to keep up with Teresa, who Teresa herself noticed and commented about. Something was very special with this Clare. Maybe Clare later as a Claymore does waste tons of energy in what she does, as is constantly commented about her, but this situation with her as a human child shows that, that if Clare does indeed waste energy, than Clare must have an "Awakened Priscilla level of 'infinite' energy", allowing her to be so wasteful of her own energy. As human child Clare shows that she does have endurance and stamina, despite what others may say later about Clare when she's a Claymore.
Well, Teresa is getting sick of being followed/stalked (lol) by Clare, so she jumps down the cliff, except that Clare follows her, splatting once on a ledge and then on the "soft"-grassy ground, somehow not breaking a single bone in her body, let alone being dead, like she should be if she wasn't superhuman, but a normal human... and according to Teresa, the fall actually had zero effect on Clare's unconsciousness, it was actually her dehydration that caused her to go unconscious and not the falling off the cliff!
Also, Clare being dehydrated, further shows what amazing endurance and stamina Clare has, being not only able to keep up with Teresa, but to be able to keep up with Teresa without water (and food too, which I'll describe below), being extremely dehydrated, wow, Clare is amazing!
Well, Teresa takes Clare and tosses her into the water, to hydrate her, and wake her up from her unconsciousness, and for her to bathe the NY smell off of her, as Clare stunk with it (just as Clare too, later as a Claymore, would notice and use Raki having the stink of the NY on him as well), lol.
We see the physical abuse on her back that she endured by the 2nd NY having her as its "toy". we also learn that not only was Clare dehydrated without water, but without food as well, as Clare devours that big melon fruit/vegetable thing, lol.
Anyways, they set off together, Clare still amazingly keeping pace with Teresa, showing her endurance and stamina yet again. Now, Clare will fall off the cliff, but Teresa catches her just in time, or... would Clare have survived even this (seemingly greater) fall as well?... lol...
well, Teresa yanks Clare back up and slams her into the cliff ground hard, lol, yet Clare's superhumanly hard body again doesn't break. let's see, getting kicked 3 times by Teresa, falling off a cliff splatting twice, getting slammed into the ground by Teresa, and getting beaten by the NY, yet not a single bone of her body is broken! Is Clare, Wolverine's little lost kid sister? Is Clare's indestructable body, made out of adamantium, or is her body simply as hard as is Dauf's Awakened body? And Clare is still seemingly just a little human child, not even a Claymore yet, and yet she has a body hardness/toughness that rivals Awakened Dauf's!
Anyways, Clare would take a step back in horror at the bandits' "plans" for Teresa, showing that she knows/understands what they wanted to do with Teresa, which suggests that maybe both the NYs had interest in Clare as well, and she grossly learned about "mating" from one or both of the NYs...
but, as for seeing Rig's hand getting cut off, Clare is again unphased by it. Also, after Teresa's "gross yoma" body flashing sends them away. Teresa tells Clare to leave as well, as Teresa is a "Yoma monster", a Claymore, and so Clare too should get away from her, but Clare doesn't, because Clare sees Teresa not as Teresa the Claymore monster, but as Teresa the human being.
We than see again how perceptive and intelligent (and deceiving) Clare is.
As Teresa had thought Clare was asleep, when she went to confront Rig again (who had been following them), yet Clare must not have been actually asleep at all, as she would try to save Teresa from getting raped by Rig, by cracking a tree branch on Rig's head, sending blood running down his face as he was atop of Teresa ripping her top open.
Clare than displays more of her toughness, as she takes a punch from Rig that knocks her to the ground, and then his brutal stompings of her, before TEresa gets up and saves Clare, sending Rig running away with her famous "Freedom of choice" speech. Clare is slowly turning Teresa into a "human" again, hehe
our Clare, who has been mute this whole time (which I forgot to mention about), finally speaks, and reveals her superhuman perception of Teresa, which shocks Teresa and even causes her to cry, as for the first time, TEresa feels human again, as Clare is seeing and understanding the real Teresa, Teresa the human, the person, seeing her pain and deadness, seeing the one thng that TEresa wants most, to "be" human again, and Clare gave that to Teresa, and in finally realizing this, Teresa breaks down and cries in happiness. "A little girl taught me that tears can flow from even silver eyes".
anyways, fast forward past the "breaking of the ironclad rule" by Teresa to save Clare from the bandits/Rig, and about the earlier scene of Teresa having left Clare there, in that town (Rokut). Teresa did not have Clare's superhuman perception and intelligence, Teresa did not understand Clare at all, not at this point in time. Clare wanted Teresa, not to be "human".
During Teresa's battles with the 4 execution squad members, somehow, superhumanly Clare is able to follow the battle, despite the speed at which they were moving/fighting, yelling warnings to Teresa in time for Teresa to react! How in the world could a human child be able to see and yell a warning, at that speed? WOW! Clare can't be human...
And than we have the most amazing thing of all, Clare is able to actually sense the Yoki of Priscilla! As she would be able to later as a Claymore identify Priscilla from her yoki alone! And it wasn't simply because of how powerful Priscilla's yoki was, as the AOs had powerful yokis and so did the Destroyer as well. So, Clare clearly truly-actually had sensed Priscilla's exact yoki "signiture" as a seemingly human child... How could Clare have "Acute Yoki Sensing" (like Galatea does) as a mere human child, well before Clare even became a Claymore? Why was Clare attacked by two NYs, why was Clare not killed and eaten by the 2nd NY at least, if not the first NY as well?
WE than see more of Clare's resolve as she becomes the first, only, and last human being to seek becoming a Claymore, hehe. Again, enduring being alone, as she searched for a BC for an unknown amount of time.