My 4 year old daughter was playing in the living room with our new neighbor of the same age. My daughter has a toy gun someone got her for Christmas. Neighbor girl. "That's not a real gun is it?" My wife says no. Then my daughter says but "soon I'm getting a real gun so I can shoot all the animals"
Good for her. Time to start her, bit by bit, with safety lessons and maybe take her out with you to shoot. If she doesn't lose interest you will have a great time, and make awesome memories, with her as she grows.