Your parenting plan isn't that crazy really. Any reason she doesn't want to go. My oldest stopped going when she was l4 and hasn't had an overnight visit for two years. She just doesn't get along with him. I know it's hard to make them go, but it will eventually work itself out. Something about him must bother her. She's at an age where things we don't think about, or remember for that matter, start to change. They aren't little girls anymore! Can you and your X talk about it?