There is
zero question in my mind that she should do just what she is planning to
I'm not in anyone's shoes, and don't know all the personal feelings, but I do tend to agree with Wildflower (such a thoughtful and well said message) in that it might be best to step out of things now.
I think only when the main players step out, or even just one quits responding 100%, eventually (it will take some time) the threads will die out. All main players in, I think it could go on a long time yet, remaining nasty, growing, and drawing more people in.
The danger in going on too long is that new "main players" can arise out of new arguments, and then it's kind of a spiraling lost cause.
I also realize it can be difficult to step out and not comment when certain personal things might be written on the board. I know I can't assume to make that time frame decision for someone, even if I think it would be a good time.
Personally, I'd probably stop responding (no matter what was written about me) when I'd felt I'd said all I'd had to on all levels about the situation and my feelings, and any other messages I did would be repetitive (I don't know the state of the discussions here because I haven't read enough.)
I think it becomes purely reactive & defensive at the repetitive point, which I know would be tapping into my inner "stuff" and wearing on me.
BT