According to a report last month by the National Transportation Safety Board, which is also investigating the crash, Vasquez told federal investigators she had been monitoring the self-driving interface in the vehicle and that neither her personal nor business phones were in use until after the crash.
Forty-nine-year-old Elaine Herzberg was struck as she walked across a darkened street in the middle of a block.
The company prohibits the use of any mobile device by safety drivers while the self-driving cars are on a public road.
In their report, Tempe Police say Vasquez was responsible for taking control of the vehicle in the event of an emergency.
A damaged bicycle lies at the scene where an Uber self-driving vehicle struck a woman in Tempe, Ariz., March 19, 2018.
Tempe police released photographs from the pedestrian death involving an Uber self-driving vehicle.
"The vehicle was in auto-drive", Vasquez, 44, said.
"You guys know as well as I know that this is going to be an global story", the police supervisor says.
Raw video: Cameras mounted inside the vehicle catches the fatal moment.
Vasquez was given a field test and police initially determined she was not impaired. Vasquez couldn't immediately be reached for comment. She had a startled look on her face about the time of the impact. In the government's report, backup driver Rafaela Vasquez confirmed she was looking away from the road but told federal investigators that she was monitoring the vehicle's experimental self-driving functions.
"She appears to be looking down at the area near her right knee at various points in the video", the report reads.
In the almost 22 minutes leading up to the crash, Vasquez wasn't looking at the road for six and a half of them ― about 32 percent of the time ― police found.
A spokeswoman last month said the company was undergoing a "top-to-bottom safety review". Of the almost 22 minutes that elapsed during that distance, Vasquez was looking down for 6 minutes and 47 seconds.
Uber is beginning to digest the information from the investigation and safety review in order to return to the road as safely as possible, the company said.
Uber has hired former National Transportation Safety Board chair Christopher Hart as an adviser on the company's overall safety culture.