As far as it being "too much gun" for the young lady, I offer the following......
Bonnie Parker, of Bonnie and Clyde fame, stood 4 feet, 10 inches tall and weighed 85 pounds. Bonnie could pick up a
20 pound Browning Automatic Rifle, run with it, shoot it while running, and hit what she was shooting at.
As I remember, B&C also favored the Winchester semi-automatic shotgun, with the barrel and stock cut down.
Bonnie was clearly not worried about recoil, but was instead intent on hitting her targets.
Determination and motivation can conquer nearly any obstacle!