BP- My son (not my H's) will be 16 in a few weeks...yikes. This is such an emotional time for them and then to throw this turmoil in on top of it, just makes it all that much worse. They are very wrapped up in themselves right now so, I am sure you are right that it has more to do with her than you. Also, I was 15 when my parents split...it is a long story, but my mother had an OM...I believe she had her own MLC. I lived with my father after they split and he didn't really care what I did...fortunately, I wasn't a bad kid. Anyway, I think I really just needed my parents to show that they cared about me, that it wasn't my fault that their M fell apart and that they would always be there for me. If she can't get that from your H, then she definately needs to get it from you...but you need to do it while giving her space.
I have to tell you that your D is at a very tough age to be losing contact with her father. Have you tried to get her counseling? I believe this is a very critical time for girls because their relationship with their father can influence their relationships with their future boyfriends.
My S has been so detached from me most of the time lately, I feel like I have lost my H and my S (the way I knew them anyway). This has been hard from me to deal with. I hope your D is still connecting with you and able to communicate her thoughts and feelings.