Jesus
1)if she is still really anxious about these cat fights and she's my age, it's clear that she doesnt understand that it all means nothing in the long run.
so that's not the advice to give to her, because she can't do it emotionally or mentally.
2) she could either
A) confront them individually and ask them why they treat her like this (individually to get rid of the mob mentality), that's if she feels like she really has to stay with the toxic group.
B) But for the betterment of her sanity, reach out to other people, more positive people even if they are "lesser", she'll eventually realize that this sucks and i would suggest cut ties before they cut ties with her, peacefully though.
switch friend group.
还说了,换朋友圈要用很长时间,如果她受不了,就找里面比较nice的人交谈看看,要!单独!面对面!和她们交谈,她们搞在一起的时候不要理她们。