My friend is starting to get annoying

My best friend has recently begun to get annoying. She lies to me and copies me like crazy.

If I say something, she says it. If I do something unique, then she does it. If I wear a bikini then so does she, if I wear one outfit, the next day she’ll wear practically the same thing. She copies my sunglasses and lip balm too.

Im starting to get annoyed. What should I do?