She didn’t kill the criminal. She used proportionate force to stop a thief.
Would you be against slamming a door on a thief, knocking him to the floor, unconscious, as he tried to run away? It’s the same dang thing.
I wish I could be on her jury.
Were the perp trying to attack her and she hit him with her vehicle, I'd be all for it. If she shot him while he was in the process of taking her purse, I'd be all for it. In both cases she is genuinely in fear for her life or serious bodily harm, and would be justified using deadly force. (And hitting someone with a vehicle is using deadly force.)
I am NOT sticking up for the perp, but I am also not going down this slippery slope.
She will be charged with assault, and she will be allowed to plea it down to a misdemeanor, but she will not get off scot-free, nor should she.