The article says "as soon as she walked into the lane of traffic she was struck".
The police sergeant also "said he believed Herzberg may have been homeless".
These three things may together indicate that even a human driver might have struck and killed the lady if she entered into the roadway unsafely. I'm not sure how everyone (especially on Twitter) can be jumping all over Uber yet until the investigation is complete.
Sad of course, either way, but not yet enough evidence to assume that the algorithm+driver combo was any less safe than a human driver alone.