Well I mentioned to her once that it seemed like she'd picked the other girls 'side' rather than mine, and she said she hadn't but she continues to be best mates with her now.
They're always together and everyone who I was quite close with is still friends with her, I know I shouldn't make them choose but it hurts to think that they just accept what she did. I have a feeling they all believe me and agree with me but are too afraid to cause trouble does this sound reasonable?
It just hurts when people are talking to me and then go off to her as soon as she appears, if you understand?
I'd definately tell your friend to talk to the one she's lost because I regret not doing that at the time.