17 year old DD is in a friendship group of 7 girls. One girl is quite controlling and everyone else ends up doing what she wants to do. My DD hasn't really seen this before (but we as parents has and didn't like it). This girl has recently started being nasty with my DD, and DD distraught as sees losing all the girls as friends as they are being passive, not sticking up for my DD when they see other girl doing this. This girl has form with this I have found out and has two other ex friends she had done this to in last couple of years. (My DD similarly passive when this happened to them- but now she sees it and no longer likes this girl, can't believe she didn't see her rude and bitchy behaviour before for what it is). Was really upset last night. She wants to speak to other friends about it but wary of what to say and it being fed back to other girl. Wants to stay friends with them but not nasty girl. Asked what she should say and I'm struggling to advise her. Anyone have any experience or good ideas? DD starting to emerge as a lovely girl after a very rocky couple of years and I don't want it derailed.