That's a good idea snowberry. I know there were, and I'm sure there are still closed sites that only EP's can access which may the best place for your mum to feel safe and find support.
I would also recommend a book 'Estranged Parents: The Devil's Dilemma' by Sharon Ann Wildey. It's available on Amazon and is the best I have ever read on the subject.
It was invaluable to me when we were estranged and I know that others have found it very helpful too.
Is it possible to remove a topic from "I'm on"
Terrible relationship with DIL - am I the problem?


. I know I'd prefer estrangement and I can understand why you you'd prefer to never hear from him again.