Earth's Survivors: Los Angeles

Leaving Los Angeles...
...
The streets were clogged with snow, but the sidewalks were impassable, so she had no choice but to walk in the street.
She made her way carefully, slipping and sliding as she went. It was just before 6:30 P.M. and she might make it to work on time if she could make the next two blocks without incident.
She had been working at the downtown mission for the last several months: The night shift for the last two months. The mission night shift was an easy shift. Everything was closed down. Those who had made the curfew were locked in for the night. Occasionally there would be a little trouble between residents, but that was rare. Watertown was small, as a consequence the homeless population was small. And trouble, when it came, was usually settled long before her shift. Her shift amounted to catching up on paperwork, dispensing an aspirin or two, and being there if there was an emergency of any kind. At 4:00 A.M. The kitchen staff would be there to start their day. Shortly after that the rest of the day-shift would be in. At 6:00 A.M. The mission doors would open and the homeless would take to the streets. She would have an hour of quiet at the end of her shift, sitting and listening to the bustle from the kitchen as they cleaned up after breakfast and began to prepare for lunch.
She heard the approaching vehicle as she was stepping around a mound of melting snow and ice. It was late and there had been no traffic on this side street when she had stepped into the street at the cross walk three blocks down. The alternative was the foot deep snow and ice thrown onto the sidewalk from the plows. She would never get through that and make it to the mission on time.
The Mission was on upper Franklin street, a short walk in a straight line, or even if you had to walk around the square and start up, as she usually did, but tonight the square was packed with traffic and so she had chosen the shortcut instead. Unfortunately it was not well lit: A four block wasteland of parking lots and alleyways.
She had almost turned completely around to make sure the car had seen her when the horn blared and startled her. A second later she finished the turn, hand clasped to her throat, and watched as the car skidded to a stop and three men piled out of the back seat slipping and sliding in the slush, laughing.
“What's up, bitch,” one asked as he found his feet and stood staring her down. The laughter died away.
“Nice ass,” another said as he moved toward her.
She turned to the second man, the one who had just spoken, as she shrugged her purse from her shoulder, caught the bottom of it in one hand, and slipped her other hand inside. The third man, really just a boy, looked frightened as his eyes slipped from his two companions and then flitted to her.
The driver leaned out the window, “What the fuck! Get the bitch!” He was looking over the roof-line, sitting on the windowsill of the driver's door, a smirk on his too-white little-boy face.
“Yeah... How about a ride, baby,” the nearest one said. The other had finally found his feet, stopped slipping, and was skidding his feet across the slush heading in her direction. She pulled her hand from her pocket and aimed the mace canister at them. They both skidded to a stop.
The closer one, the one that had made the remark about her ass, cocked his head sideways, shrugged his shoulders and then pulled a gun from his waist band. “Yeah... Kind of changes the whole situation, don't it?” He asked.
His gun was aimed at the ground, close to her feet. She had only a split second to decide. He was less than five feet away, the gun rising from the ground, when she pushed the trigger and watched the stream leap at him. His face went from sarcastic smirk to alarm just before the stream of mace hit his nose and splattered across his face and into his eyes. A second later he was screaming. She had just turned to aim at the second guy when the world turned upside down...