I am familiar with psychosis, and after re-reading your post up there, I'm certain that mental health is playing some role in this, however, her self-medicating with drugs and alcohol is a whole other matter! ... Have y'all tried an intervention? ... A lot of drug and alcohol use can also lead to psychosis, and quite frankly, she's putting other people around her at high risk for physical and emotional harm ... If the magistrate won't help, then your mom may have to institute that tough love thing which doesn't seem to have an exceptional success rate either ... I guess the bottom line is that until your sister is ready to "save" herself, then nobody else can do it for her, and as painful as it is to see her destroy herself, the question for your mother to have to answer is will she be willing for her daughter to destroy her too during the process ... Sorry I deleted my other post, I didn't think it would be helpful, and this one may not be either ... There certainly aren't any easy answers when things have run off the rails this badly!