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So, she walks over the bridge to an ATM to get money for a cab. On her way back over the bridge to catch a cab at the arena she was either snatched at random or like someone else here suggested she was accidentally hit by a vehicle and they took her and dumped her. If she was hit by a car, though, there should be bits and pieces from the vehicle left behind at the scene. Also, if it was a hit-in-run to hide the body, that person would most likely have grabbed her purse and cell along with her. More likely to me that she was randomly snatched and the perp didn’t care about leaving her purse and cell as he was only interested in her.