Do you think Adam may have been jealous of her students hold on her time and attention?
Possibly, but I think it was more just rage and a desire to wipe her out along with anything she valued. Who knows why a crazy person fixates on a particular family member?
Poor mothers! Women psychotics usually focus on a relative (either one of their parents or one of their children) of the same sex, which would mean the mother in the case of a psychotic fixated on a parent. At the same time, male psychotics also often seem to fixate on their mothers.
And in this case, the parents were divorced (having a child with problems of this sort is a real strain on a marriage, leaving aside everything else), and his mother had taken him in, so I guess she was naturally going to be the target, along with everything associated with her.