I am an emergency dispatcher so I know how the 911 system and pinging phones works. Every 911 call that comes in has an active location map showing where the phone is pinging at that time, as long as the call is active, and gives an "uncertainty" radius that the phone is within. There are a lot of variables as to how accurate this is including the phone company, how good the technology of the phone is, and how many cell towers are in the area. I have seen uncertainties as low as 5 meters and as high as 30,000 meters, which is obviously pretty much useless. Once the phone died, they would have had to call the phone company to get a location, but they would have been given the same location as their equipment showed when her phone died, as they were the ones talking to her at the time. So dispatchers had a general idea of where she was from her 911 call and officers likely located her vehicle pretty quickly. Because the phone died during the 911 call, an active or updated ping could not be obtained from the phone company as the phone has to be powered on. The phone company can only give a last ping at that point, which is the last location the phone pinged when it was powered on.