Whether or not anyone feels he should or shouldn't have given her the order to get out of the car, the fact of the matter is he did, and by law she was obligated to follow the lawful order of a police officer.
Yes, we understand that.
We are discussing how the officer could have deescalated the situation, saved himself a lot of grief, not put himself in danger, not put a civilian in danger, not put a civilian in jail over complete nonsense, not wasted his time booking her into jail while he could have been looking for real criminals, not wasted the tax payers dollars for not only his time but the booking and jailing process as well as a lengthy and expensive investigation into her death, not broken department policies, not have his department that has a history of racial issues in the national news and potentially under increased scrutiny, and overall not been a giant dick when dealing with a civilian that already told him she was agitated. Even worse is if her statement was true he caused the entire incident to begin with by tailgating her, which in my state is illegal, which caused her to make a sudden lane change to allow the officer to proceed to wherever he was going as timely as possible.
The warning was already written, he showed it to her after he cuffed her. Instead of going full on douchebag because she dared to refuse his request of putting her cigarette out that she was smoking in her own car he could have had her sign the damn warning and the entire encounter would have ended right then and there. Instead he escalated the situation to a completely unnecessary level with a person that he knew was already agitated.
It's truly sad that so many people don't expect better from our so called professional police force. That this is the best we can hope for from people who voluntarily signed up and are supposed to be trained professionals at interacting with agitated and irate people for a living.