What should i do !!!!?

i have this person who copes me in every thing EVERY THING every one told me that i should get over it and ignore it but seriously she copes me in every thing my laugh my smile the way i dress if i wore boots one day and every one said that they look really cute the second day she wares boots she copies me in my answers like what do i wanna be when i grow up same answer what is my Favorite food , color , place even who is my CELERITY CRUSH ! i told her to back off but she would not stop it ! even in art class she looks to the teachers disk and then copies my painting ! and if there was a project or something she takes my old project ideas and do it ! i can't tell cause the teachers change every year and they don't know that i did it first then she gets the complement for my ideas ! and the worst part sometimes she rub it right in my face and asks me what do i think ! the even worst part is when i yell at her she start's crying and tells every one that i'm mean and for a a hole year she told every one that we a best friends and didn't leave me alone she just kept following me every were like a puppy dog any way when i scream at her she cries and go tell her mom and her mom would call me ! and tell me it's not a big deal but it is for me but she doesn't care any way i stopped talking to her but she would not stop and when i tell the teachers they tell me it's not a big deal ! what should i do ! and i bought a guitar so she bought one and started learning and i also said that i want to learn piano and drums she started telling every one the same thing ! help ! i don't talk to her that much but she would not stop it ! BTW she's 14 years old and i'm only older by 6 months and i'm like 5'1 and sh's 6 feet tall or something it's creepy and she one of the people who think's every one is reach and there is no one is hungry in the hole world and there is no such thing is poor people any more and she acted like she was surprised in one of the english classes when we were talking about this stuff and the funny part is that WE LIVE IN EGYPT WOMAN DON'T U GET OUT ON THE STREET !!!