I’m a girl…but I agree with you Faisal…turning to your parents won’t really do her any good as they won’t really understand what’s going on. Instead of making a big fuss by telling the parents and all she should be strong enough to deal with this on her own. And if he doesn’t even have her number then what is she concerned about. If they don’t talk then let him do or say what he wants since all her friends know about the situation they’re not gonna believe him anyway.
P.S not directing towards your friend. But I’ve seen some girls that like the attention and like it when a guy is desperately after them. It may seem they hate it but deep inside them they enjoy every bit of it. 