I was beginning to wonder if the shooter had been molested there, as a child.
Since it’s been established that “she” is previously associated with the school, I’m guessing that somebody on staff there possibly (POSSIBLY) abused her when she was a student.
OR... she isn’t a she at all...and took lots of heat for being a trans freak in that particular subculture...and this shooting is retaliation.
... just a guess.