So I know no-one is on here. Like ever. But if you are here, hear me out.
I think she’s from modern-day Turkey or nearby. My rationale:
Ayla is a Turkish name
Her parent/s were probably travelling when the earthquake happened since Ayla did not seem familiar with the environment and no matter how powerful the earthquake, I am sure that more than one would have survived if the whole cave had been there. This means she probably isn’t from modern-day Ukraine.
I don’t have any citations, but I’m pretty sure that even the Mamutoi also describe her face as foreign. If this is true, I doubt she is from modern-day Ukraine.
Just an idea.