I also agree, she might be better off shooting some lower recoiling slugs, this way she can actually get time HITTING things , and more used to the gun


as for the future, they do sell recoil reducing stocks for the 500, as well as adjustable length of stock, which would also help then with fit MAYBE<, and kill two birds with one stone for you's!
they look something like a like a AR style stock
like this

https://zahal.org/product/fab-defens...gl-shock-grip/

or there is a more traditional looking stock you can also adjust for size like this

https://www.midwayusa.com/product/1006671941/