Was it? It's easy to make judgments like that about spit second choices when we were not there.
In my personal opinion, I don't believe she meant to hit him but obviously she meant not to comply with the order to get out of the car and she panicked.
As for him, I'm not surprised he shot her. People have been interfering with and obstructing ICE officers from the beginning and the shooting of the National Guardsmen has shown that violence from protestors is a very real possibility. So naturally, when she accelerated to escape, her vehicle - from his perspective - appeared to try to run him down.
Given the way protestors have been behaving, something like this was inevitable.