What to do when someone is copying you?

I have this "friend" at the moment and she is copying me and its getting rather irritating. Im not the only one who has noticed it. Infact, two of my other friends pointed it out to begin with. Its not just clothes she is copying its my personality and personal likes and dislikes. The other day she stole lines of my about me section on Tumblr and put them in her own, its getting ridiculous. I confronted her about the matter but she seems oblivious to it and keeps making ridiculous excuses for it. I can't even spend time around her without her irritating me. She is even trying to get in the middle of me and my closest friend, by being really immature and inviting her places without me. Just the other day, she started mouthing off about the fact i called her before i called my closest friend and was clearly trying to make my closest friend jealous. Im just completely dazed by this situation and can't handle people who copy off others and are not themselves. Any idea's how to handle this, she is a lovely girl and was before she started copying everything i do and say.