When a girl wakes up with amnesia in an alternate universe called Fayra, she has to find a way to get back to Earth and recover her memories.

Yeah, I think Lucius is right there. Probably your idea makes sense, but you're not expressing it clearly in the logline.

As always, what are the stakes? Is the alternate universe good, bad, or a bit of both? What does she stand to gain or lose from staying/returning?

If she wakes up with amnesia, how does she know she's not already where she's supposed to be?