I've had custody of my daughter since I was divorced. Now she's 13 and suddenly has decided she wants to live with her dad. A friend of mine, another single mom, had a similar situation with her son when he became a teenager. A. Independence is a primary concern of teenagers. They naturally gravitate toward what's out of a parent's normal range of control.
Some teens feel trapped, even if they have a great home life.
Looking at the issue from this perspective, you can see why your daughter might want to live with her father. It would be a new situation and that's appealing to a teenager. This isn't a simple or clear-cut issue. Whether or not your teen moves depends on legalities, the kind of home situation to which she will be moving, and what will work for all parties. Consult legal and counseling professionals for guidance and direction.