Well done for staying strong - proud of you

I don't have much input on the ex and her friendship groups, but she does tend to fall in with new groups easily, mirroring them - she never does anything awful to them to end up without them, but somehow she seems to move on from each new group all the time... .
I think it's because she sees them as her new best friends, whereas for them, she's just another girl who has hung out with them once or twice.