I hope you didn't invite her to the amusement park. I would stop doing anything with her that resembles a family, I wouldn't even chat with her... only important stuff about the kids, period! Make it clear that as long as there is OM in the picture, you will only be tolerating her, no friendship...
Me: 37 W:33 S: 2 M: 9/5/09 Suspected: 1/7/12 Confirmed: 2/10/12 Served: 3/29/12 W moved out 3/30/12 First court 5/17/12 HELP!