Figuring her family was too risky to turn to, Selina considered her college roommate, Hailey. The two had only known each other for a couple months, but Hailey obviously knew Selina had far more money than someone with her background and lack of job should.
Also to her benefit, Selina hadn't refrained from letting Hailey benefit from it either. Letting Hailey use her expensive make up and clothes and splurging on shared items for their dorm had established a fairly pleasant relationship between the two. Selina couldn't say she trusted Hailey, but at the least Hailey directly benefited from helping her which was close enough.
Typing in Hailey's number, Selina decided to leave the big revelations aside for the moment to avoid Hailey writing it off as some weird joke. So, she simply told Hailey that she needed help immediately and where she was. Selina was able to breathe a sigh of relief when Hailey responded she'd come right away. All she had to do now was figure out how she would explain the situation and stay out of sight until Hailey arrived.