IIRC, she was in the process of trying to have him committed when he exploded. She had jumped through several hoops and had more hoops to go to get him placed in a hospital without his consent. He murdered her first.
I think that his mother had finally acknowledged the problem - although way too late.
But she had been so defensive earlier that she had pulled him out of school when one of the teachers suggested that he be evaluated for schizophrenia and that he needed more than just Aspergers therapy, which I believe is mainly language and socialization oriented.
I worked with parents like this in another lifetime, so to speak, and it’s very hard for them.
Seems to me she should have jumped on doing this much earlier, when he was just a child. I can’t believe she didn’t see this coming. Ignored it, deluded herself, sure. But not see it at all? No way.