Don't worry about her she is like gum on the bottom of your shoe,annoying but you can scrape it off and it's no longer an issue.
Don't make this about her. She is not the cause for you and Xh's issues she is just the effect (band-aid). The work is up to you and XH, the more you bring her into this the longer she stays in the picture. When i was getting phone calls from who-ever(don't think it was her but someone she put up to it) I told H but, then thought about it and stopped because it just kept it alive and it needed to die . Taht way it's about him and his issues only and he has to work on those himself.
JAK
You don't get to choose how you're going to die. Or when, you can only decide how you're going to live now. ~Joan Baez