What is up with this girl? please answer? good answers?

So me and this girl were cool. We went to the same college last year but now, im 80 miles away at another college, but still then we were on good terms, often talking on facebook about casual stupid stuff and making jokes. Ok to start the first incident, however im not sure if this bothered her or not. I got a picture of this girl from the internet, she was ms. america like a few years ago i think. But when i got the picture i got a real bad one of her as a joke and posted it on her wall on facebook saying that this girl looked liked her. She was like what? what are you talking about? and i was like come on nikki, you know you look like this girl when you get up in the morning ahahaha. Thats what i said. but she acted like we were still cool, i didnt think anything of it after that. then like a week later, she was having a conversation with someone we both went to school with on facebook and he was joking around saying you suck! so i thought i would intervene, i said yeah hes right you do suck, you and your cheap azz leopard clothes. Then it seemed like 2 days later i was blocked from seeing her facebook wall. I could no longer see any posts or be able to comment. So i sent her a fb message, saying if i offended you in anyway, i am sorry, i thought i was just playing around like we always did. She didnt respond. So then about a week later i sent her a text saying hey nikki, im not sure if you got my previous message but i am sorry for if any feelings were hurt by me joking around. She said "i dont know what your talking about, but i think you were just commenting me too much". i thought when she said that it was just a cover up, cuz she didnt want to admit what was really bothering her, cuz we always had a good time in person when we went to school and on facebook. I just went along with it and said ok, i will back off. Then about another week goes by, i notice that we are no longer friends on facebook and i dont know when exactly she deleted me. So i just left it alone for about 3 weeks and then on thanksgiving, tried to add her back cuz id idnt want there to be any hard feelings. I even sent a message, saying yet again that i regret what i said, can we just start over. She left my request pending for like 3 days and i know she saw it, cuz she was talking to our friends on their pages. So i got angry and cancelled the friend request and i blocked her. Then 2 days ago i unblocked her cuz i didnt want to be petty. so i was able to see her on facebook talking to our friends, but i would make a comment first on their status and then knowing that i already made a comment, she wa sjust talking to them like i wasnt even there. The lastnite i noticed that she had blocked me, and now i cant even find her on facebook. Why is she being like this? why wont she give me the chance to formally apologize. She just completely cut me off for something that could have been over with a long time ago. I feel like she is holding a grudge, ima guy btw, and next semester im gonna have to see her, cuz we hang out with the same group.