It might be worth teaching her the basics of how to break someones grasp by rotating her hand against the thumb joint or attacking the little fingers. I started that game with my daughter when she was about 4 and to outsiders, that's exactly what it looked like but it began teaching her how joints workand in what direction they don't like moving. Now at 16, it's Krav Maga and any other nasty ideas we can come up with.
At the end of the day, anything is better than nothing.