Locust, I would echo what a few above have said. Go Slow. My son showed a real affinity for guns. A good shot with a pellet gun and a 22 before he was ten. Liked to shoot a lot.
When he was about ten or eleven I had him start with a youth 1100 in 20ga. He shot it quite well at first. Then he got rather spotty. He would break 5-10 straight at trap then drop a few then hit one drop a few more ending up with 15s and such.
I put him in a trapshooting youth group which shot once a week. One of the guys who was coaching noticed almost immediately that Craig was flinching on many of his shots. I immediately had him quit shooting shotguns at the range. Went back to the pellet gun and 22. After a year or so I let him go back to a shotgun but only had him shoot starting with a low gun in sporting clays and hunting.
He is a now 14 and fairly good shot and loves to hunt but he is not really "into" shotguns. He does not want to go to the range and shoot much.
I know it is hard as can be to wait, especially for years. But it is almost impossible to undo bad experiences. How many of us have ever seen a dog who was improperly introduced to guns get over gunshyness?
Go slow. Shooting BB guns and pellet guns is excellent, especially if she really likes it.