Hi Southernstar, glad you found us!
Schizoaffective disorder plus BPD sounds overwhelming for her and those around her, like you. When did she get diagnosed? Has she been accepting of either or both of her diagnoses? I'm not knowledgeable about SchAD, so does medication help that, and if so, does she take Rx (or, in the past, did she)?
That's really good for your grandchild that you were able to adopt. Kids need stability and you can provide that.
She has a history of violence and gravitates towards violent individuals so I’ve decided to cut off all contact.
That sounds wise to remove yourself and your grandchild from her path. Does he know "what is up" with his mom, at some level?
She just sounds like a not safe person to be around at this time in her life. I wonder if you feel the grief along with the betrayal, that she doesn't seem to want help and isn't getting better.
I hope you have a lot of support for you and kiddo as you go through this. Are either of you in counseling?
Keep us posted on how things are going, whenever works for you.
kells76