One of two things that come to my mind concerning this incident is the importance of mindset.
She just had a mindset that allowed her to persist and prevail where she was outnumbered, outgunned and where the assailants not only had the drop on her but fired first.
http://www.11alive.com/news/article/...ld-be-robbers-
The other thing that this episode does is reinforce my theory that a DGU by a citizen almost always results in no bad guys remaining at large for very long.
The one assailant was wounded and taken into custody, and probably ratted out his partner whom police are looking for now...