It doesn't matter if she was impeding an ICE smash and grab. It doesn't matter if she might have clipped the ICE officer at 4-5 mph when she freaked out - because the officer shot her after all the ICE agents were already out of danger of death or significant bodily harm. And it's not clear that she even clipped him.
Most police departments have policies around this. The DOJ does. I can't find if DHS does. You are explicitly not supposed to shoot at people fleeing in cars outside of it being an immediate necessity to save lives or significant bodily harm. That clearly is not met here. It's also not even a smart way to handle it - dead people can't control the accelerator or the steering wheel. Point proven when right after that the car accelerates.
The expectations for someone given the power to enforce the law, detain people, and use lethal force when required to are, and should be, many times higher than that of an everyday citizen. Should she have tried to flee? No. She would have hit him for sure if he didn't step out of the way. But it doesn't matter relative to the greater issue at hand here, which is that we should be able to trust our LEOs to not needlessly use lethal force - but we can't.
Wow. Just wow.