Help!!! WHAT SHOULD I DO?!?!?! Dont read if ur a guy u wouldnt know. pretty long...only read if u have time.?

im real and never gossip or backstab. im fun to be with and i'm never moody or mean to ppl. I'm not "popular" but i have frans. im a really gud friend!! honestly. yet im having a huge problem. ok just so u kno im 13 ending my 7th grd yr. anyways. ok it all happend lyk 3 or 4 days ago i think. for english we went to the library and played jepardy to get ready for the lang arts final. im sitting by this girl and shes ok and everything. u kno smart but idk "cool". watever and its girls against boys. so we're playing and i cant open my mouth without being shushed by her. all girls r sitting at a table in a circle and my friend [not saying names] is behind me. whoever wins the game gets to have 20 extra points on final exam or gets to be exempt from a project. so anyways im playing the game and blah blah blah. and i couldnt talk to anyone cuz i told u bout girl shushing me. and so at the end ziri is acting lyk a bch and ignoring/excluding me pretty obviously. so i wrote her a note wen we got back to cl saying: u kno its pretty obvious wat ur doing. and she writes back: YOU FIGURE IT OUT SINCE UR "SO" SMART. so i'm like: OK??? if ur making this a big mystery im not gunna waste time bothering to. AND SO ON. and so my friend tells me l8r on why shes acting lyk dat and she says cuz i was "ignoring her". wow. its not like i was trying to hun! sorry if u cant handle me not talking to EVERY second in that pd. so i wrote her a note and i dont wanna explain it in depth but she writes me this huge long thing and im like thinking: WTF?!?!?! ur making a huge freakin drama out of nothing. and so now shes acting like a hurt little puppy and is talking smack behind my back. i heard from many ppl tht she said: "oh i could NEVER be her friend after wat shes said to me". WOW. shes the one being completely moody and uncalled for.... so ya im really mad. help? advice? thoughts?