Ymir's decision and background

[ImmortalZodd]

On those covers it was also said that only the rich and powerful were transported in boats. That would probably include royalty from various nations which would make Ymir one of those 'survivors' descendants. Cool idea.

edit: IIRC the covers said that half the boats went missing? Maybe they were just taken to other settlements on purpose and weren't told about it.

edit2: And so if Ymir was in those other prebuilt settlements and was royalty, that's why she would be like Chirsta, and that's how she would know so much about the world as those secrets would be passed in her family as well.