Does my friend feel guilty?

My best friend, now just friend, went misters before sisters and d*cks before chicks when she was stupid enough to get back with her pig of a boyfriend BOTH times he cheated. She changed into someone I didnt know, and she and I got distant. She wasn't there for me when I needed her most. She always ha excuses to get off the phone, I never got invited over anymore. She even changed her profile pick of me and her to her and him. She stopped wearing her matching BFF necklace that I got her. I was hurt. After months and months of feeling sorry for myself and after an incident of me confronting her and telling her I don't know her anymore, I've taken action by moving on and getting new friends. I was successful. One day while over another friends house, she calls my cell phone and my house phone( rare!) to ask if I want to come over and have a sleepover. I didn't answer cause I didn't hear it ring. But my mom answered the house phone, and said she sounded a little upset when my mom told her I was at a friend's house. Now, I have a profile pick with another friend. At band practice, she showed up wearing her Matching necklace.. She also hugged me and told me she was super-proud of me and happy I'm her friend. Today I got a text saying " I was just cleaning out my binder, and I found the picture of me and you and the little poem you wrote on the back. It made me tear up!" She always kisses up to me.. Why does she do this, after all that distance? I just don't get it.. Does she feel guilty or something?