Jamesy wrote:
Since then I have been trying to avoid her by stopping going to certain house parties etc.....
My mom commented on me trying to avoid by her saying "now James she will pop up again because she is part of your friendship group". My mum then said "we'll on the outer edges of group that is". How do you think my mom was trying to help me by that comment?
Your reaction was to stop going to certain house parties.
Your mom normalized the girls presence and then marginalized the girl slightly with the "outer edges" comment. If you accept your mum's viewpoint that the girl's presence as normal and marginal, that might make you feel comfortable about returning to your normal socialization activities of going to certain house parties. Her second comment might help you marginalize the girl if the girl attempts to bother you again or dismiss the bothering as unimportant.