Rhe police had her license plate number. Her physical description. They had the nature of her offence being a non-violent crime. The car did not quickly accelerate and the police officer against all common safety advice put himself in the path of the vehicle.
That his first action was to pull a gun and fire and not just get out of the way and approach the problem at a later time in a less heated situation is excessive force. Back when I worked security I watched lots people pull this stunt on police officers before and surprise - none of them got shot and none of the police got hit by a car and everybody still got their resisting arrest charge at the end if the day.
If you are scared enough your psychological reaction is to stay in a place of safety or to flee and cars provide the opportunity to both… Which is why you aren’t supposed to put yourself in the path of someone’s potential escape with your body. People are panicy animals who can divert entirely to basic instinct, particularly when they are hurt or in a lower estimation of being able to defend themselves like pregnancy.
This is an example of someone killed because of bad police training and decision making that ignored entirely how scary even normally benign police interactions can be to black women. If she was worried about harm to her baby because of the police’s habit of putting people forcefully on the ground or slamming them against cars she would be placed under extreme distress having one yell at her to leave her car like they meant to do her violence.
The police here created wholecloth the “need” to shoot this woman. From the moment they started escalating, blocking her route of egress and not taking the moment of thought to ask if this could not be de-escalated and addressed later safely given the minor nature of the complaint.