I can’t provide any advice, but I do sympathize with your situation. The children’s safety is paramount. I hope their protection will be the priority. I might get a legal opinion about how to get her into treatment and what measures could be taken. I grew up with a parent who suffered mainly untreated mental illness and it was extremely distressing. Living in the home with someone exhibiting those symptoms is disturbing, especially for kids. I was fortunate that my grandparents cared for me as much as possible and provided me with unconditional love, support and care. I hope you find some solutions. It’s good you are trying to help.