Because the one thing you can't teach is what recoil feels like. She turned to the side and pointed the gun at me, safety off, finger on the trigger, so that I could take it from her.
For ANYONE who is introducing a new shooter to firearms:
Before the first shot.
1. Load with only ONE round.
2. Inform the new shooter that you will crowd them from their strong hand side and tell them why you are doing it. (To keep them from turning around after the shot with the gun in hand and sweeping the line.)
3. Keep it light. There's no need to threaten them, just tell them that it's very natural to turn around after the first shot and that safety has to come first.
4. Tell the shooter to take the shot and then put the pistol down pointing downrange after the shot.
5. Place the target close enough to guarantee a round on paper.
6. Remind yourself that YOU are the one responsible for safe gun-handling since the new shooter doesn't have the gun safety rules ingrained like you do. Remind yourself that if there's a safety violation it's going to be YOUR fault.
During the first shot.
1. Crowd the new shooter from the strong hand side for the shot. You don't have to put your hands out and hover but you need to be close enough to reach the shooter's strong hand arm to control it if need be. I stand just behind and to the strong side and put one hand behind but not touching the strong hand shoulder to prevent the shooter from turning. I leave my other hand ready (but not hovering) to control the arm with the firearm if required.
2. They may not turn after the briefing you gave them but they'll probably forget to put the pistol down. Don't grab the pistol and wrestle it away from them, instead remind them to put it down pointing downrange and gently prevent them from turning away from the line until they do.
After the first shot.
1. Start off with positive reinforcement. (They hit the target, didn't turn around, didn't shoot anyone)
2. Remind them that the handgun should end up on the bench pointed downrange after it's empty and gently point out any other issues.
There will be no blatant safety violations because you prevented them.
3. Don't rush the shooter back to the line. If they got an adrenaline rush you want to let them calm down a bit before they shoot again.
Now you can either repeat the procedure as if it's the first shot or move on to loading two rounds in the gun depending on how the shooter handled the first shot. Usually it's just the first round or two that require really close attention.