This kind of thing scares the crap out of me. I have a 151/2 yr old daughter I don't leave her at home by herself. I work from home a few days a week, I have dogs (big ones) and guns but it would be a bad day all around if I had to shoot some A-hole trying to get in to my house. I am happy the lady just started shooting and didnt ask questions.
Have you taught her to shoot, how to access a loaded firearm in the home and under what circumstances to do so? There have been several events over the past year where armed youths have repelled home invaders successfully.