Girl problems...

phuturephillie: I am having some trouble with a friend of mine. She is almost like a sister to me but a few months ago I think I started to like her...then one night we were texting I said a couple things that really upset her and hurt her. However, I have problems with my memory and I can't remember what I said that hurt her. For a while now I've been trying to get her back as a friend. I've admitted to her what I did was wrong an promised it wont happen again. But for some reason she still is upset with me. I'm afraid I've lost her as a friend forever and I don't want that to happen. What do I do?