Ok so i have a big friend problem and yes this is the edited one?

Ok so i was playing duck duck goose with my 3 other friends and my friend Lauren goes, i dont wanna play a kiddie game and so i said "sissy" and i was totally messing around like completly and she got mad at me ever since. so Then i keep ping her notes in school and she goes and throwes them away or she writes dont talk to me or usually says, "leave me alone." i leave her a,lone but i want her back. So to day she pes me a note and says i want to be friends but not as close as we were. So i said Ok hat is totally fine. i wanted to be more but shes taking it really slow. So then the next period she pes me a note and says, I dont want to be your friends. iSay why? and she goes siomeone told me u were talking about me behind my back and i didnt and she thinks im lying about talking about her but i dont talk about her behind her back!!! I need help in what to do and when to do it. I said im sorry 90 billion times but she wont forgive me and i write her a poenm of how nice she is on get this!!! on face book i wrote how awesome and cool she was and the next say i went on her profile to see if she commented and said oh tnax i 4giv you. no. it was the opposite. she DELETED IT!!! Please help i have no idea what to do! Thank you so mich and Please no negaive comments.