I don't know what response time is in her jurisdiction, but in the City of Atlanta we had a break-in with a burglar IN the house, and it took the police almost one hour to arrive. And that was almost 30 years ago - the response time is even longer now if they show up at all.
And what's more, the criminals KNOW this. Everybody in town knows that the APD "lost" over 22,000 police reports in an attempt to make their crime stats look better. Everybody knows that they don't respond to anything but "officer down" in less than an hour, if they respond at all.
So the police would arrive to find her bleeding to death or dead on the sidewalk (since she may well have known her attackers - see the third arrest were she was set up for this robbery by a "friend" - they would kill her to eliminate the witness) with the useless cellphone clutched in her hand (assuming the guy didn't steal it).
Dial 911 and die. Dial 1911A1 and live.