My (19F) roommate (18F) copies everything I do

Ik the title sounds childish but hear me out. Since I’ve moved in with this girl a month ago she copies my every move. If I wear red Pjs she wears red Pjs. If I buy cheese slices, salami and lettuce. She buys the EXACT SAME thing the next day. If I shower, she showers on the same day. If I put my shoes outside my room, she does the same. If I change my bed sheets, she does the same. These r just the small things I remember.

If I’m sitting at my desk or just doing something, she looks at me from the corner of her eye.

Idk y but it bothers me. I don’t see it as flattery, I just see it as someone who tries to steal my personality.

Why are some girls like this? Like what’s the thought process here, what would u get out of copying someone’s exact personality??

How do I deal with this because I can’t ignore it. It’s a student dorm, her bed is next to mine, she’s literally 6 feet away from me as I’m typing this.

NOTE: I did not mean this in a narcissistic way. I realize the showering comment bothered some ppl but the only reason I mentioned this is because she used to shower MINUTES within me showering even if she already showered that day, now it’s just the same day. She would also RUN to the bathroom to get to it first when she realizes I was getting up to use it. I would also come back from classes and see my stuff in the fridge has been moved around and the next day she has bought the EXACT same stuff I got a day earlier. I should’ve explained the situation thoroughly. I was looking for advise from women who had to deal with friends like this not judgement from people who have never been in this situation.

UPDATE: she now bought the same towel as me. Also got similar bed sheets and is currently trying to copy my schedule despite being in different programs.

EDIT: I wanna thank all of you who gave sympathetic replies. Just wanted to update you all. She has copied A LOT more than this but I just wanted to give the general idea. Anyone who has dealt with a girl like this knows how frustrating and invalidating people can be whenever you say “someone is copying me”. This behaviour is OBSESSIVE and potentially dangerous. I am currently looking for a new room. Again, I wanna thank all of the women who have been sympathetic.