This girl readded me but why?

Im a guy and i sat beside a girl in cl and i added her to facebook and then we had a facebook convo and at the end of the convo i said she was not worthy to be on my list and deleted her. Then after i deleted her i sent her msgs like yoo $lut, go make me a sandwich kthxx :) and hi ugly :) and i said i was sorry for being mean and she said to stop sending her messages or she was gona report me. Then i called her babe and told her to add me again and she replied babe? Dont think so. Then i wished her a great day and said i needed 1 more friend and i would pay her $5. So i sent her a request and she accepts it. Why though. She hasnt asked for money. She used to make fun of me in cl and tease me and act like i was stupid. She has a boyfriend.