I mentioned this possibility yesterday. Maybe her mother (where is her father?) thought her problems could be resolved with a more strict learning environment and moved her from public school to the Christian school hoping her academic performance and other problems would approve.
The killer resented the move and blamed her mentally instabilities on the school. I would like to know who her treating physicians were and what medications and hormones she had been taking.
I’m surprised she didn’t kill her mother before attacking the school.