she racked the slide then pulled the trigger
Why, exactly, did she do that? (I understand that in an "unthinking moment" there may be no explanation.)
Biggest problem here is muzzle was not pointed in a safe direction (even more important than the "bang switch" rule). I would sentence your wife to 30 days of having to carry the gun (unloaded) around with her, IN HER HAND, at least an hour every day, so that it becomes unconscious second-nature to keep that muzzle pointed away from her and others no matter where in the house she is, and that it feels down-right awful, even with the action open for cleaning, to have it pointed at herself. Any portion of herself.
One of my instructors mentioned, "You can always tell the folks in the class who have been shot. You accidently cross one of them with your muzzle, and your next realization will be that you're on your back, your arm is sore, and your weapon has been taken away from you. So don't do it."
I keep the fired case from my AD, years ago now--no one hurt--on my night table, and look at it everyday.
Seems an advantage of FMJs over hollow-points is that accidental injuries are more minor.
And I don't even want to think what a rifle AD would look like ('course, it's harder to cross yourself with a rifle!).
Wishing her a speedy recovery, and a long memory.