Against my better judgement and good advice here, I went through with it and we survived. I wound up going to their house and spending 30 minutes on basic gun safety before leaving. And strongly emphasizing that we will be entering a military-like environment and there will be absolutely no place for screwing around. It went well, although I had to continually remind her to keep her GD finger away from the trigger when the gun was unloaded
I think that's a common rookie error.
I let her use my P22 Walther. Good thing. She took one shot with the 9mm and immediately set it down on the table and walked away. In the end, she absolutely loved shooting and we hit the local gun shops on the way home looking at .22 pistols.
All that said: I will NEVER do that again. Too much stress. I don't envy instructors. And I wish I would've seen Bill's "one round" at a time suggestion beforehand.