The S&W shield 9mm is a good choice, I have trained women in the safety and use many times. They seem to function well. I might recommend, you go to a range, where the have rentals, she could get the feel, and choose the right one for her. Biggest mistake made when buying firearms for the spouse, is the guy buying what he thinks she may be able to use. Let her handle it, rack the slide, get a feel for it. Any quality gun shop can help her with this.