So when whe leaves (if she leaves) go NC unless it involved wee one and that's a wrap...nothing more you can do than cut her off, protect yourself and your family...and be prepared for whichever way the chips fall...
In my sitch, I laid down the law, telling W to leave- "but I have nowhere to go..."
Once she met OM2- she didn't mind sleeping at 3 diff houses- in fact she loved it b/c all of her friends could see what a tyrant I was and she felt fully supported to have her way...UGH
Ken you are a man and you're doing what you need to do...now, don't back down, ask her to leave and be the best dad you can be...no apologies, NC