WIBTA for cutting off my copycat friend

I (F) go to school with a girl who we will call grace. Grace and I used to be kind of close. We didn’t hang out much, but we were part of the same general friend group. We had some similar hobbies, such as playing piano, which we bonded over. Over the past few months Grace has made more effort to get closer with me (asking to be partners, wanting to hang out, etc) and at first I thought it was nice. But then she began putting down my other friends, such as complaining to me that some of my closest friends’ hair was “too short and too curly”. Her natural hair by the way.

I’ve noticed that grace has begun to copy some of the things that I do. This includes mannerisms, specific phrases that I use, and even music taste. I like old rock music, and she likes newer pop. I’ve never made fun of her for her music, I think music is incredibly subjective. But, there have been times where she’ll ask me what my favourite song is, and quite literally turn to someone else and say that that song is *her* favourite. I also have a music app where you can add friends and track your listening history. I never mentioned it to her, but suddenly I get a friend request from her. Over the past 3 weeks, she’s posted an instagram note every day with the song that is at the top of my listening history. That can’t be a coincidence.

Grace doesn’t just do this to me. She completely copied the hair and makeup of another mutual friend (who doesn’t like her anymore btw). It was so obvious that everyone in class was talking about how she “stole her face”. When asked, the friend who she copied, said that she hadn’t given her any tips or suggestions to do it. She simply took one photo she was sent, and managed to somehow recreate her entire look.

Also, in passing, Grace asked me the name of my piano teacher. The next week, I saw her at the class before mine. Then, she asked to be switched to my group for recitals. I feel like I have a doppelgänger. I want to cut her off, but at the same time I feel bad leaving her friendless. So, WIBTA?