How do I get my friend to stop copying me?

For context, me and my friend are 16 and 15. I first met my friend when we were walking to class one day and she called me pretty. I thought she was really nice so I started talking to her more and we became really good friends. I even introduced to some of my other friends.

Over time, I have noticed she has became more like me. She started straightening her hair (my hair is straight) and started typing and talking in phrases like I do and has even told me that she started saying them bc of me. My friends told me that I am overthinking things and that she just looks up to me so I didn’t think anything about it at first.

Then I told her about this one guy I liked and was talking to. One day he stopped talking to me and I found out he was dating her. She told our other friends that I didn’t like him as much as she did. I kept my distance from her after that but I became friends with her after they broke up because I felt bad for her. But I noticed a pattern of her becoming friends with people who made fun of me and letting what her friends say and bfs do control her life and how she treats me. She also started telling people I was her sister and telling people very personal stories of my life.

Every day I feel like more and more of my identity is being taken away from me. She keeps copying the way I talk and my style, she always texts my mom and will talk my exes with my personality, she keeps becoming more involved in my friend group, and no one understands how I feel I don't know if I am crazy or not for feeling this way.

Should I talk to her about how I feel or what should I do?

Updates
1 y
I am 17 not 16**
Updates
1 y
I agree with y'all who say I need to cut her off but I also have strict parents so I am scared if I cut her off she will tell my parents lies to get me in trouble.
How do I get my friend to stop copying me?
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