I dont think you've done anything wrong. Personally, I wouldnt have stepped between 2 of my friends fighting unless it was major and one of them was definitively in the wrong. Next time she says something i would say something to the effect of "(Name of friend) I'm truly sorry I hurt your feelings by stepping out of the fight between you and (name of other friend). However, I can't go back. I hope we can continue as friends but if we do I cant allow you to continue to treat me in this manner. I have apologized (X number of times) and Im ready to move on."

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