I think there is a lot to like in this swing, especially with her hands. Many players this age develop "bat drag" issues, but I do not see that here. The big thing that jumps out to me is her back leg. She is doing the dreaded "squish the bug" thing. While she is trying to transition her weight, she is losing it because of that back foot. Try sticking one of those spare balls an inch or so to the right of her back heel (toward the catcher), and ask her to duplicate this swing without moving that other ball. If she can improve how she uses that rear leg, she could be very good. Have fun.