How do you deal with the gossipers?

okay i have this friend. shes a big gossssippperr. shee cant keep a secret and she always has a i couldnt careless addittudee. and yet im wayy older thenn her.. but she treats me lyk im the litttle girl becuz im shorter than her.. and wen evr i telll her off. she gives me the same face my mom does when she doesnt believe me. and just well she just manipulates my mind. and always testing my memory,, example: i say to her.. well u r always never keeping my secrets,, and then shes all. reeally . yes i have. and im like no u havent. and shes all name one tym. i struggle trying to remember becuz of the pressure of everybody looking at me and her constent starring at me aah!.... and its hard to just ignore her becuz shes friends with all of my friends at skool. and wenevr im lonely sshe thinks lyk shes soo popular that she can talk to whoevr and just tell sumone to give me a hug like a demand. wen they dont have to.. she just aah! acts lyk she is my mom that has to get me friends.... but IM OLDER! im the influencer shes the influencyy. and its just soo hard to get away frum her. cuz shes everywer. and wants 2 no everything. about everyone.. and she doesnt care that guys only like her for her boobs not her face. cuzz shes one of those well (ugly girls with big boobs) and she thinks shes all kool becuz the guys ask her out and i have heard them say that they think her boobs are awesum and stuff. and well its just annoying. her i couldnt care less addittuted.......... ah. how can i possibly get away frum her for now... just until i kool down.. i try to be alone alot. but then she sends sumone over to me to talk to me... and aaah. and if ijust walk away frum her or anybody they'lll think im mad at them then they will start saying stuff and then no one will talk to me because she just tells them that im in a bad mood.. and i should know that that is exactly wat will happen becuz it haz happened be4. several tyms... ahh. help me out here>>