My friend keeps copying me?

sorry i know people say its the best form of flattery but honestly, its getting annoying. if i say somethign thats sarcastic or somewhat funny, my friend will literally memorize it word for word and say it to other people. shes starting to talk AND type the same way i do. omfg she's taken so much of my clothes and shes so naive and cheery that its hard to tell her to her face to stop. she also copied my voicemail... x_x its gotten to the point where iwant to stop talking to her!