What Bree, no Frags in your arsenal?
Anyway, I agree with not relying on the intimidation factor. Aside from all the above mentioned, if it all comes down to it, you just gave the intruder a chance to draw down on you.
But Bree is right on with anyone (not just women) who shoots, you should use the largest caliber that you can comfortably handle. You can always use specialty loads if need be.
One thing I do not recommend is a 22 or 32, it wont stop anything that is on drugs or pumped up with anything, it will just piss them off.
If she can handle it, a 357, or 45. 9mm is often questionable as to stopping power as well.
Great to hear she will be taking training courses.
Great, now that I have read all this I feel like going to the range.