I probably should have said nothing at that point...but instead I commented that I wanted to talk with people that have our son's interest in mind, not people that believe her fiction of being an abused woman. She got very quiet when I said that - and I wish I hadn't let those words slip out that way...but I cannot continue to validate her distorted belief that I am abusive...eve if it's just for me to know it...
Based on how she is behaving now, it may have been exactly the right thing to do.
I seem to recall a couple of times while she was still living with you that you called her on her allegations of abusiveness and on her own abuse, and she seemed to back off at least temporarily.
In her current emotional state, she may not grasp the distinction between validating her feelings and point of view and agreeing with her point of view.