Some of the hyperbole in this thread is spectacular. The anti-US defense force is operating at full capacity, as expected. If three guys break down your front door, fully armed, you are talking out of your ass if you seriously think you would have time to logically plan out a response in which no one gets hurt. Incredible.
I'm not a big fan of guns, but this woman is both incredibly lucky and justified in her actions. They are armed robbers who kicked down a door and rolled in guns blazing. By acting the way she did she may have saved her own life. The extra shots may not have been necessary, but to expect someone who's just been through what she was to act completely rationally is asinine. No one can be prepared for that.