If she is new to shooting, learn to shoot left handed and be done with it.
My granddaughter is 9 years old, and left eye dominant. Her dad and I are starting her off the right way . . . left handed.
I had a battle of my own, growing up left handed and loosing the sight in my left eye in 1980. It was a hard row to hoe, learning to shoot all over again right hand (at age 31). Especially the long guns . . . UGH!
Good luck!