How to tell my mom I don’t want a relationship with her?

Sorry I know this is very long but I don’t know what to do.

I don’t have a very good relationship with my mom. She’s an alchoholic with slight multiple personality disorder and mania. She was pretty awful growing up and would constantly yell from 8pm - 2/3 am. Throwing stuff around the house. Stomping and slamming our doors open to ask something like who opened a packet of ham. She used not being allowed to eat as a punishment sometimes. She would kick my older brother down and scream at him for not being able to look her in the eye (he has cerebral palsy). She’d accuse me of trying to steal her bf and called me a whore. She’d accuse all of us of trying to kill her but then when she was depressed she’d say we’re the only reason she hadn’t killed herself. She also didn’t have a car or a job and blamed everyone else for her problems. All the money she got was spent on alchohol or sewing supplies. It was “her ex’s fault” that she didn’t have a car because she got in a accident drunk driving to go see him. And it was my dads fault that she was broke and didn’t spend the money she got wisely. She was never supportive and always put me down. She’d wait until we got an eviction notice and hand it to me saying that she didn’t have money to pay it..... we lived in low income housing and rent was 60$. She would run out side and call our neighbors Sp*cks, causing problems for us because we were friends with their kids. She now has a bf whos helped her calm down a lot. But whenever they are fighting she stops taking her pills and has crazy mood swings. I’v been moved out for 3 years now and have avoided her a lot just making excuses not to see her but now she’s texting me almost every day and calling. She made a baby blanket in hopes that I’ll have a kid for her to babysit. I feel bad because sometimes it seems like she’s not fully there in the head but I really don’t like being around her - every time I’ve tried to bring up my childhood she says she did nothing wrong or brushes it off as the past.

Has anyone else gone through something similar? I want to find a peaceful way to tell her that I don’t want her to be apart of my life- or at least until she’s ready to take ownership for the things she did.