J.W.
A court appointed guardian ad liem or a CASA volunteer would be the best way to go. If your daughter is in school, talk with her on-site counselor or your pediatrician about her behavior. Maybe they can talk with her with you outside the room so she feels free to express her feelings without hurting yours. Kids have a way of being more 'adult' in a divorce than the adults. It may be her way of coping with her dad's absence. I can remember when my kids wouldn't talk to their Poppa on the phone when he was gone fishing in Alaska for the summers. They loved and missed him dearly, but if they didn't talk to him they didn't have to 'acknowledge' he was gone, they could 'punish' him for not being home with them, and they weren't reminded of his absence, because it hurt. When he came home in August after being gone for 3 months they couldn't get enough of him or he them. Sounds like Dad is missing his daughter, all of his kids quite a bit, just as you would if the roles were reversed. Divorce is not easy on anyone. See if he can send a digital picture frame filled with pictures of him with the kids. Ask him to send cards, letters, pictures of himself and things that he's doing now, and they can send similar things back to him. You're going to have to be very supportive of this activity, because you will always have a relationship with this man, just not a marriage. Your kids are the ties that continue to bind you and no divorce will severe them. I wish you and all your kids well.