Yeah, they're all loco af, and she ain't an exception. Heck, the tall oppa is probably the most sensible of them all. And maybe the father, it would be more interesting and kinda logical this way.
The coolest turn would be if the MC is really the weirdest one, constantly being an unreliable narrator and misinterpreting everything like everyone's out to get him. But that would be asking too much from the author, judging by his other works.