Cute girl. It's a shame she was out burglarizing people's homes at 4 am. Whether she was entering the buildings or acting as lookout while her friends entered, she was part of a criminal enterprise. Some people are barely getting by. If you kick down their doors and steal their stuff, you are putting their lives in danger. I have a little sympathy for the girl, if she didn't understand, but Darwin is a harsh teacher. I wish her parents had done a better job raising this girl, so that she wouldn't have been there and been shot. She was shot in the back of the head? I'm just barely okay with that. If she was a lookout for the other three burglars and turned to shout a warning, it's hard to see the aspect change in the dark, particularly if she moves after the decision to shoot. The outcome is sad, just as the outcome is sad that a cute little boy like Trayvon grew up to be the kind of kid that has to be shot in self-defense, but once the kid makes those bad decisions, I won't fault the shooter (who may well feel pretty bad about this outcome).
If she decided, by her actions, to transfer herself into the category "Targets" ... her blood is on her own hands.