If someone had pointed a shotgun at me and the most expedient thing was to hit him with my car, I would have done the same thing ... and then I would have held him at gunpoint until the police arrived.
She didn't know it was an Airsoft -- he had removed the orange tip and it looked exactly like a sawed-off shotgun. Should she have waited until she could have determined it was only a replica?
What is it about her testimony and the resulting investigation that confirmed the correctness of her actions that you find "wrong on so many levels?"
What would YOU have done in her situation?