I doubt that her friends "hate" you. They are probably just trying to do what you did to her and ignore you as well. I'm sure that they are just trying to help their friend move on and by chatting with you it would only make it harder for their friend to stop liking you. Unless these friends of hers were also your friends too, I would just forget about it if I were you.

Ok so 1 you just didn't look at her 2 her friends hate you because they don't know wat you really feel I'm a girl and that happened alot just don't pay attention 2 her