My friend is copying EVERYTHING I do?

She follows me everywhere she is a tomboy I'm a girly girl I got this make up kit and she went and bought it at our prom she saw the dress I was wearing and wore the same dress I was mortified wore the same make up and all. She copies EVERYTHING. If I like a boy band she will say she likes them even when she doesn't. I got this body spray and she said she had it and sprayed it under her armpits then I was like 'it's a body spray' and she was like I knew that.. she says she has everything I have I got a new phone and then now she wants it saying she has wanted it for ages..She fancies the same guy I like and its generally annoying me..