GIRLS, I need your Perspective?

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My ex-friend is being a real AS$, She has been mad at me since xmas when I told her off for not being a good friend.I tried several times to work things out with her even though she was at fault,without success. She has tried to make me out to be the bad guy by talking smack to everyone behind my back. The girl has no reason to be this mad at me much less talk Shlt about me. I was always a great friend to her and was always there for her and she knows it. So why the F would she be acting like this and saying that stuff to people about me? Even now I'm still cordial to her. So WTF? Any Ideas?