Have you ever tried to help her? I know you have no training in this but I think DBT is used for that...perhaps you could apply some of the techniques that are used I mean I know as someone with psychosis it was useful to get reality check from other people and other social support that was sort of counter-stigma. I mean my perspective is that we all generally want help and support from other people so perhaps your mom could benefit from some sort of help from you---it would require understanding how she thinks though which might also be helpful for you allowing you to sort of detoxify the situation. There is a big difference between someone being a jerk and someone being a jerk because they are sick...the second is much easier to forgive.