I absolutely agree - I can't believe that Dr. P brought this woman in, especially at this point. I mean, this woman has made it perfectly clear that she can't stand her DIL & is openly hostile to her! I mean, don't get me wrong, I don't particularly like the wife to begin with, cheating on her husband & then bold faced lying about it like that. I know that we all make mistakes & nobody is perfect, but this ones a doozy. Plus, she doesn't seem sincere about trying to fix ANY of this. Watching her with the stepson, I felt sooooo sorry for that poor kid! Her response to him really was lacking in appropriate contrition, to me anyway. If I had some poor kid, who I was responsible for, telling me those things with tears in his eyes like that - OMG! I would be sobbing I would feel so bad about what I had put him through. Yes, she mouthed all of the right words, but I didn't see any true sorrow for her own actions on her face. It kind of makes me think that maybe the MIL has a point & this woman is a drama queen & is just doing this for all of the attention. But there is always the possibility that she really is going to try.
But bringing the MIL into the home with them at this point is just going to make this woman feel even more backed into a corner, more defensive and make it that much more difficult for her to relax enough to make the changes in her behaviour which she needs to, even if she is sincere about wanting to.