The fact that the mother doesn’t use the daughter’s male pronouns suggests that she didn’t support her transgender delusions. There are reports that the mother was Christian and worked at a religious school, so she may have held traditional views on gender. Would not suprise me if there were deep disagreement between that was a factor in the daughter’s actions. My impression is that her shooting up a Christian school was, at least in part, a viciously cruel way of inflicting some sort of punishment on her mother.
I thought the shooter had attended the christian school which would add to your understanding of the mother maybe not being the evil we are presuming, but then again its still sick to think of your own loss when your child killed others