Thank you both for your advice. You confirmed my decision to stay out of their relationship, while promoting a positive and open atmosphere in our home. My STBX and I had another mediation visit with our lawyer today. He spent the first 10 min relaying to me how my daughter has been acting in the last month, and basically, he would like me to encourage our daughter to have a relationship with him! He wants me to solve his problems, like I've been doing for the last 22 years! Later on he grumbled that he won't be paying for college if "she keeps this up". So it was decided that he would call my daughter's counselor and get his advice about how to reconcile their relationship. It's out of my hands - I guess!!!
Thanks!