What more could I have done?

Although it may be tough, you need to stick to your guns and keep walking the other way. No one deserves this treatment and she needs to learn to own her behaviour. She is playing a game and desperate for attention by the sounds of it. You could easily ask the same of her ... "if she loved you she wouldnt have done any of this". Drop it and don't listen to mutual friends. Time for you to put YOU first (has she ever done that?)! Good luck in moving on. It is well worth it in the long run ... I hope you get past this quickly.