Yes, definitely! My daughter was in the same boat, but at age 9. It will help a lot and not just for pirouettes. Especially when she starts performing on stage with dances that shes moving around and jumping more. She simply won’t need to worry about her glasses falling off.
The biggest thing we were told that we had to teach her, and it turned out to be no big deal, was managing her lenses all day at school when we weren’t around. If your DD struggles a little, its fine, just let her wear them for ballet, then back to glasses when shes not dancing until she gets the hang of putting them in at a moment’s notice at school.