I had a friend who once watched a prison inmate fleeing pursuing guards. The guards shot the fleeing felon. Never any charges. Isn't this similar?
Had she not stopped the suspect, chances are he would never have been apprehended, and therefore on the loose to possibly have a physical altercation from a robbery victim.
I understand where you're coming from, and I'm not saying that she deserves jail time. But no, your example is not the same thing because the prison inmate was charged, tried, and convicted in a court of law, and was serving out a lawfully adjudicated sentence in the custody of the State. Fleeing Felon Rule.
Had she not stopped the suspect, chances are he would never have been apprehended, and therefore on the loose to possibly have a physical altercation from a robbery victim.
Another slippery slope. In all likelihood he wouldn't have ever been caught and tried for this particular crime. But speculation about his possible future actions, without the knowledge of his prior actions, is not justification for deadly force. Would she have been equally justified in shooting the guy in the back as he ran? How about if she just hit him in the leg?