Depending on what happened, it might be all her fault.
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Basically, the police have already said that. She stepped right in front of the car. Neither the driver or the car had time to react. The driver never saw her. His first indication of the accident was the sound of the impact.
Many states and localities competed for testing after California began placing restrictions on the testing of self driving cars in public venues. Money is involved which always alters the playing field. Police answer to city hall.
So, in other words, he wasn't paying attention. There is no way to hit a pedestrian with the front of your car and not see it happen, unless you weren't paying attention.