Most Helpful Girl
Probably an accident, just pretend as you never got it, she's probably already embarrassed enough.
Most Helpful Guy
It seem like she wanted to talk to you but, thought about it since it was 5am. If so she's probably hope she hung up in time before your phone rang. If you are interested in her you should call her to check on her to let her know you were thinking about her. That would put her at ease.