YOu handled it well... She was baiting you to argue about OMW, but it sounds like you were shrewd enough to not take the bait.. you let her rant about OMW and just let it go... good going!
She's gonna sulk for a few days, so try to not do anything to set her off... okay?
If OMW can be more public about OM's commitment to her and actions he's doing... public so your wife will get the message that OM is NOT going there... that would likely help... all she sees or hears is what HE tells her and what her imagination cooks up... if OMW can start posting her positives on her facebook I suspect that your wife will read them and get the hint...