She will love it - except it gets expensive to compete in a serious manner (ammo, not gear).
Competition will hone those shooting skills that could be most needed in real life and will make for better decision-making skills because the competitor won't have to think about getting the gun into action - more thought can be given to the situation.
A competition shooter is more likely to survive a multiple assailant encounter as well, since they have been trained out of the shoot-look habit of the average shooter.
Nothing but good can come from this. I encourage every CHL holder, anyone who carries a weapon for self protection to get involved in competition pistol, whether they intend to win or not.
Amen to that.
I run IPSC matches geared toward those new to the sport. They are always amazed at the mental and equipment breakdowns when you add just a wee bit of pressure.