She's probably a self-aware yet not aware alien/sub lizard folk species.

Kind of like the meme that the majority of the rich, political, and celebrities are lizard people.

This could probably be a decent horror movie where we follow a girl who comes to terms that her whole town is actually a colony of lizard people, and that 20-40ish years prior the adults and previous generation decided that for them to survive and blend in better with humans they don't tell their progeny that they're lizard people til maturity, to help further blend in and acclimate their nature.