She's in therapy specifically to deal with her feelings for OM and you can see evidence that she is trying to engage more with you and your kids?
That sounds to me like someone who is trying to get over an affair.
I don't see how confronting her is going to help with anything, Usually the point of confronting is to get the spouse to stop the affair, get into therapy, re-engage, and provide transparency (which you are dismissing as "over explaining").
Read DB and work on your issues, but I wouldn't go dark or do LRT or confront.
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