This is not looking good. I wonder if this harassment extended to stalking? Could someone have been watching long enough to realise her new place of employment didn't have cameras? Perhaps they found a way to lure her outside, she went outside as part of her duties (emptying rubbish bins?), or went back to her car to get something, leaving an opportunity to take her against her will, or to lure her into a car. Perhaps this harassment actually came from somebody she knew without realising it, so willingly got into a car of an acquaintance? Perhaps she left the premises willingly during a meal break but things went awry with whatever she was doing during that time. I wonder if she usually took her break in a staff room, her car, or maybe there was a nearby place open 24/7 that she would go to for food or drink? I'm not American and unsure about your work rules. How long would she typically get for her main break during a shift like this?
EDIT: I just read the latest news report and it appears she left early into her shift so likely not related to a meal break.