I'm a spry 70 year old woman who is active running a business and a pretty full social life. I've really got the shooting bug and have had the pleasure of shooting several different kinds of handguns with my shooting coach. He tells me; he coaches and I listen appreciatively.
I settled on a 686 357/38 4" barrel for range shooting and think I'm about settled on a Model 67 w/4" barrel for home protection, and I am not going to use +P loads. The difference in "home protective power" is nil and wanting to be as diligent as possible with shots possibly penetrating a wall, etc. has led me to this conclusion - The K frame is perfect for me, and a 38 spcl is velet-like to shoot and a proven stopper.
In 5-10 years, who the h____ knows what I'm going to be capable of; everyday now is a great one if I can can get up and make a difference . . . but there's no fooling myself that these days are golden and must be cherished.
Keep it simple (point, squeeze, bang), keep it easy (no high performance rounds needed - a nice 38 spcl shooter), and keep it interesting if not outright fun (let her choose, let her play a little or a lot - like me, and advise but don't make the decision).
She'll love you for it and remember once again why you are so great. Takes my take on the matter from nearly the same place she is at.
Take care, enjoy life, and smile a lot,
Rachel