Over what? Correct me if I am wrong, but the car had the right of way and the person illegally crossed. Regardless of any improvements in what the self driving car/driver could/should have done, it seems clear cut to me that the root cause lies with the person.
So reading this article [0], it seems as though both parties are evaluated for their actions and blame is assigned proportionally. So while the women jaywalking would probably get the bulk of the blame for jaywalking, the driver/uber might also get some due to software error/driver inattention.
My guess for why the cops are not really going after uber is because the women was reportedly homeless so she does not have any family to fight for her case.
I’m not sure about Arizona, but murder in common law doesn’t require intent, only that a reasonable person could have predicted the action would lead to someone’s death.