re: Glock 17 or Glock 19

Are you completely set on Glock for her? It's a great platform and obviously proven but I've taught females that found the grip to be rather chunky if their hands were small enough. In general, the grip width for most double stack Glocks will be the same.

I'll paste a bookmarked post I made a while back:

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Honestly, most grips that are tapered make it easy for women to shoot. I've seen this numerous times in my classes. The most well-liked guns that women shoot in my classes are my M&P full size, and my girlfriend's VP9. Guns like a Glock 19/17, FN FNS9, FNX45, Springfield XD, or any gun without a grip taper will feel 2x4ish. The "grip taper" I'm referring to is that the width of the grip increases as you get father from the slide. So it will be slimmer closer to the slide than at the magwell. Here's what I mean (notice the VP9 is slimmer at the top and the Glock has the same width throughout the grip):