I'm curious to hear what the vets say, but I wouldn't confront because I don't see how you can control who she takes the kids to see.
Trying to control what you can't control makes you look weak.
Me: 44 H: 44 Kids: 20, 16, 16, and 10 Together/Married: 22 years H announced he was emotionally detached and considering D: 4/4/16 H announced he is going to try to stay and reconnect: 5/1/16