Interesting question. I haven’t seen her in a while, but the last time I saw her, she was 17 and looked about 11 or 12.
is she a case of arrested development, in more ways than one? Certainly when it comes to global warming, she has a very childlike, black/white, absolutist view of things.
Maybe she’s being given puberty blockers?
Maybe she’s against kids going through puberty, without “knowing” their gender yet.