From what you've said, it sounds like she felt torn between you and her D and family. It sounds like you may have asked her (directly or indirectly) to choose between you and them.
Now she can see her family and do whatever she wants with and for her D and not have to feel your anger or disappointment.
It's very, very hard to "blend" families.
M:63 H:53 S:41, SS:28, SS:25, SD:23 M:15 T:16
Bomb:12/17/11, "I think we should go our separate ways." H moves to his mother's house, 4/1/12 12/21/12: H moves back home, piecing