Of course her not complying played a big role.
So that justifies deadly force?
I guarantee you 100’s of agencies have it in their policy that state you are prohibited from creating a situation where your standing at the front of a vehicle WHEN YOU DIDNT NEED TO BE.
If the driver of the SUV had just shot at another cop/agent/civilian and there was an imminent need to apprehend that driver (or prevent the driver from committing subsequent felonies) then the cop/agent would have been justified being at the front of the SUV and using deadly force to bring the incident to a conclusion.