Sibling with Schitz and substance abuse

My sister has been diagnosed with Schizophrenia. She was about 25-26 years old. She has two children she no longer has custody of. When she was a teen she began partying and was out of control. She had developed an eating disorder, Bulimia. My parents placed her in rehab for treatment. This went on through out her teens. She started drinking alcohol when she was 14 years old. (as far as I know). I believe she has done drugs but as to what type, I do not know. When she was 18yrs old she went back into rehab for treatment. When she got out she met her now ex husband. He was a wild person and very bad influence. My sister began stealing and committing minor criminal offenses. She received a DUI. He was on drugs and doing criminal activity as well. We tried to put a stop to their relationship but it did not work. He ended up getting in serious legal trouble which he ended up having to choose between jail or military. He chose military. My sister began pregnant and they both appeared to clean up their act. He was relocated several states away and soon was deployed. My sister was taking care of her child and going to school. She seemed well. It seemed the party life had calmed down. When he came back for deployment I had visited them. My sister disclosed to me that there alot of military people who have access to drugs such as cocaine. She was having issues with him drinking and parting. When they relocated to another area his behavior got worse. She became pregnant again. Due to his behavior she started acting out again but  then seemed to confess she no longer wanted to be with him as he was cheating, drinking, and doing drugs. She was planning on leaving him. She was in that process when we came and got her kids. A few days go by and we start receiving concerning call from her. She sounded scary and was hallucinating. We went to get her and she eventually was placed in a physch unit. She was diagnosed with Schitzo. They gave her medication and she began to get well but then went into denial about the mental illness which she stopped medicating herself and went back into psychosis. The MD said her Schitzo was permit this time. MY mom took over her life and was helping with the kids. By this time her ex husband was dishonorably discharge. Prior to her leaving him she began telling me he was poison her coffee. She even sent me a picture with white beads around her coffee. The MD said she had suffered severe domestic violence which is what brought on her psychosis then schitzo. I will never forgot the phone call right before she went into the first psychosis. She was so normal sounding and so scared of him. I over heard him admit he was a sociopath. My mom took over helping my sister and the children. Over a few years my sister became non compliant with my mom. The ex appeared to get himself straight. (they went through family court) My mom tried to get custody of the children but the court saw that in their opinion the parents were "fit". My sister has a degree in which she could not hold down a job. She was out meeting random men, having bizarre addict issues, and not being a responsible parent. She could not even bath her children or keep the home clean. My mom had to constantly check on her. She went from job to job. The courts order her to have a shot every month. Well as few months ago she went back to court, gave up her kids, said my mom was over bearing, moved in with her (continued the concerning behaviors of meeting multiple men, multiple jobs, and no thought processing, no trying to get her life straight, denying she has issues, and so on. We finally told her to leave and she went to stay with my dad. My dad fought the same situation but he was better to control her. She got better but appeared depressed so they started letting her work. They let her go to a relatives business that sells alcohol. (did i mention that she can consume an enormous amount of alcohol in a sitting, example she drank a 24 pack of our beer within 4 hours.) She began drinking while working there. I had warned the family. They eventually saw this and decided to no longer allow her there. She was having strange men show up and she ate a relatives 14lb ham as well as drank almost all their alcohol in one night. (im talking a 5th of whiskey and several wines and beers) We started suspecting she has an eating disorder again. When we confront her she will sit and listen or she becomes defensive, She literally acts like a child. She had over 15 W-2's come to my mailing address for the year 2017. She wrecked her car 6 times in which my parents to it away from her. When she gets a job she acts like a teenager getting their first job. The jobs she is getting are jobs anyone who has a GED can get so its not like it would be difficult to get. She has the same repeating behaviors. She is a great manipulator but she is so naive and gullible. She has capacity (or else we would have her committed) but strong poor judgement. We worry that she will end up dead by either suicide, substance abuse, or murdered. My mom has even said she has come to peace with my sister if she dies. I am at a lost as to how to help her. She goes to the appropriate doctors. We do not know what she tells them. I am thinking about getting some mental counselor for my own health because of this. I worked with vulnerable adults but I can seem to help my own. I know the legal routes and I know the things to say but as long as she has capacity and is not self harming or a threat to others there is nothing we can do.  Any advice?

The father appears to have straightened himself up and has the children. They appear well cared for and we do seem them. 

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