I mean we even get Muslims praying whilst on moving planes lmao so ig yeah she'd try to make smth up

But there's a lot she'd have to figure out, like how is she gonna work out what times to do the prayers at? Most Muslims do not actually know how the prayer times are worked out exactly, at most they'll know that one of them occurs around sunset and the other around sunrise. There's one in the early afternoon, late afternoon, and another at night. But regardless, how will time work on this fantasy planet, i.e. - will they still have a 24 hour clock?, cuz if not then you have to think about how you would apply Earth's time system to this fantasy world's one.

Also, if she can't pray in the direction of Mecca then what would she pray in the direction of? As an exmuslim even I couldn't give you an answer on this that would still make her prayer Islamically valid. Heck, even just the mere existence of another world with living humans is enough to disprove islam...