Honestly, after watching the videos, I would have taken the same actions as the police. They didn't have a time machine or mind reading device. what they had was an active threat in front of them and a fast decision to make before she became more of a threat to the public or other officers. All of this talk about how they 'should have shot the tires out' is Hollywood, not real life. They had no clue if she was armed or if her car was a bomb. She was given the opportunity when they blocked her in to get out of the car and stop, but she didn't. Instead she rammed them, tried to run them over, and kept going. How would that be different than, for example, a suicide bomber trying to get through?
But what if they did 'shoot her tires out' and it actually worked (which it doesn't work the way people think). They knew there was a child in the car and that could have resulted in a hostage situation with the child, with far worse results.
Considering reports have about a dozen shots being fired yet the child was unharmed shows a carefulness on the police's part.
I'm giving the police the benefit of the doubt in this sad situation.