Vigilante justice, would, in most cases, be frowned upon by the police and society as being dangerous and counter-productive to the justice system. You are in no cases expected or encouraged to chase a criminal down, as it could result in more injury - of yourself or others.
However, in this case, where some C-WORD straight up RAN A DUDE OVER and kept driving, I give her pursuer the MADDEST PROPS EVER. I feel bad that she will likely leave her children behind when she spend time in jail, but anyone who hits a 75-YEAR-OLD man on a street, tossing his frail body into the air, all because she wanted to get around a car that was going too slow for her, well... pardon my French but BITCH NEEDS TO PAY.