My daughter broke contact with my son several years ago even though I was still involved. She worries about my safety, but we have a good relationship. We both accept the place we are each in. She knows how hard it is for me and I know she needs to protect herself and her family. I didn't understand addiction at all until I came here. Saving my son was all I knew. I had to see others taking difficult actions before I could do it myself. Maybe your mom would read a book on addiction or try Alanon. Maybe she will exhaust herself like I did and seek help.
Take care of yourself. That's what my daughter did and it was good for her.