I was thinking here....
Yuri is just over 500 years old and it took her around 200 to 300 years to become a ranker and another 100 to be a high-ranker.
Assuming that she started climbing the tower at an extremely young age, then it has been at least 200 years that she has been a high-ranker. Again, going from the idea that she was already an HR when Phanta entered the palace and taking into account that Urek didn't enter immediately. This Princess Zahard makes no sense.
Assuming that it has been less than 200 years since Urek entered the tower, this girl is not a ranker, especially because Yuri's achievement of finishing in less than 300 years was enough for all the praise she received out there. In other words, this princess would still be a regular.
The problem is that Arie Rose and Gladmary are fighting, to the point that all the other known princesses are involved, that is, 3 possibilities:
1. This princess is already very close to being a ranker and does not want to get involved with the other two because she is probably preparing herself to be targeted by the ranker princesses.
2. She's Gladmerry.
3. It's simply dead.
Of course, even if Phanta's attack and consequently Urek's entry occurred while Yuri was an A ranker about to become a ranker or in the 100 year period that she went from ranker to HR, it would be almost as good a climb time as Yuri's and she should have already been mentioned.
Or the SIU simply shit on the entire blog post and everything we have about Phanta is filler.