You are wrong on several points. It is policy not to shoot a car like that even if it is driving at the officer (which this vehicle was not doing and can clearly be seen from multiple camera angles). Shooting the driver will not stop the car, it will just kill the driver.
And in this case, shooting her made the situation much more dangerous. It caused her dead foot to stomp the gas pedal, dangerously accelerating the car uncontrollably until it crashed on the side of the road.
