sometimes people just get offended, and you can't always predict and avoid it. it doesn't sound to me as if you did anything wrong, or anything you could have done to avert the drama.
some people are truly addicted to drama (usually the ones who yell the loudest 'i hate drama! this is a no-drama zone!!') and need the adrenaline it creates to distract them from their real problems. it sounds as if she may be one of these.
i appreciate your desire to work through problems and not cut people off, but bear in mind you can only offer that from your end. if you are behaving in a framework that lines up with your own ethical code, you are open to receiving friendship from her again, and have offered what white flags you can, rest assured that the ball's in her court now and move on. if and when she cools down and wants to talk, great! if she has added you to her list of 'cuts', well, nothing you can do about it. wish her well and enjoy your mutual friends without her presence.
khairete
S.