Well of course this wasn't an isolated incident. Her lez wife is on camera blaming herself saying she brought her here.
Lets take another look at video....
At this moment use of lethal force is authorized to the discretion of LEO. Vehicles are considered lethal weapons when use in crime which is why in some states state police are authorized to pit/TVI a vehicle when it runs from police. The moment she hit the Ice agent with her vehicle use of deadly force was justified even if she was running away. When a suspect is confronted by a LEO and suspects opens fire then runs away a LEO can and have shot suspects in the back while running away as they still have a gun in their hand. Same goes for a vehicle once you use vehicle to hit a LEO you're pretty much in severe danger of getting shot even if you don't try to hit other LEO's as you flee.