Umm…The fact that she claimed to be “transgender” is the clearest proof there can be that she was mentally ill. Every single person who claims to be “transgender” is mentally ill, specifically, afflicted with deep delusion. That’s what “transgenderism” is, a delusional belief.
These people are also universally sociopathic, though some act out their aggression toward normality in more dangerous ways.
I’m asking when it popped up. Not whether she was mentally ill at the end.
“...while she was a teen, or [while she attended] the school.”