its Possible it’s becoming more of a reality now . Maybe the sleepovers were a tad much for her. I would just give her the extra love and attention she might need right about now. Maybe you can do a daddy daughter activity individually with her. Perhaps she will open up to you. My daughter around your daughters age had a tough time with the D. And she hasn’t known anything different her whole life. The school actually made a little “lunch club” for children of divorce. It actually helped her immensely. Just be there for her and ask her some open ended questions. When I did that to my daughter she spilled all her feelings out like a waterfall