My brother and sister in law used to own a jiu jitsu school. In fact, my sister in law is/was one of the first female jiu jitsu black belts in the US, one of the female Dirty Dozen. She is #8 in this article:
https://www.bjjheroes.com/bjj-cultur...jj-dirty-dozen
Anyways, when my daughter was 8-9 years old, she took a jiu jitsu class with my sister-in-law. I learned quickly that I probably didn't want to wrestle with my daughter after her first month of classes.