She came down the street, swung wide left, then backed straight in to be perpendicular to the street against the right curb to cause the maximum obstruction. You cannot back straight in without your wheels being straight.
When her girlfriend yelled for her to go, she spun her front tire trying to pull out and when she started moving and the cop was in front of her (he was crossing over to be on the driver side to assist the other officer asking her to get out of the SUV), she went towards him and begun cutting her wheels presumably to avoid hitting him.
But she clipped him anyway and that is when he shot her in self-defense.