Hi and just want to say, I can relate to your daughter so much. I'm a grown woman, but I remember my teen years, vividly.

I agree with Bill3---try and get your daughter engaged with some new people---maybe art classes, or something else she might enjoy. Success in areas not directly tied to school will give her the confidence boost she might need. I know it did for me.

Point out to her that you value her kindness, and that you understand her not wanting to be a jerk to these girls. Give her validation, without chiding her for it. Point out that not everybody is raised with the same values as her; and that while she might be inclined to continue to tolerate them, hoping they will change, that might not be the best avenue for her, psychologically.

It literally took me YEARS to snap out of that kind of thinking. It would have been so much better for me to hear it from a a trusted adult. Teenagers are at a stage where they are formulating and cementing their value systems. They can handle many more adult concepts than they are given credit for. Show her a more mature way to think about this, including the talk about how good it is to have boundaries; and emphasize how important, and okay it is to be self-protective about all of this.

Being rejected from this ugly little duo is a far better outcome than her going through life trying to keep the peace by "pleasing" everybody---or at least, not offending them. That kind of thinking got me nothing but torment by bullying, narcissistic types until just a few years ago. They zero-in on kind individuals, and they are reluctant to let them go (because they feed on the pain and confusion they cause). There is no changing them. They either get punched out by bigger bullies, or they grow up to be monsters. Trust me on this. They are not her friends. She needs encouragement to visualize her life without them in it.

She also might be afraid of her own anger. Talk to her about acceptable and unacceptable ways of standing up for yourself. Maybe steer her towards an outdoor physical activity that can help her re-direct some of her emotions. Exercise oxygenates the mind, improves our nervous system, and can put a lot of things in perspective for us. (In other words, set aside time every day where she is not attached to her phone. Get her doing other things.)

You're a good mom! I know you can get through this.