WWYD (what would u do) please advice needed!!

ok so my 'friend' (i don't even know what to call her atp we definitely aren't friends imo)

she like indicates she wants to talk to me by positioning herself angled at me whenever we sit down in form (first period everyday) or she'll just stare at my face and like thats not THAT bad but like to top it all off she FOLLOWS ME EVERYWHERE? AND ONE TIME I WAS JS SAT IN THE LIBRARY DOING HW AND I LOOK UP AND SHES STOOD ON THE OTHER SIDE OF THE TABLE STARING ME DOWN LIKE WHAAAT. she didn't even mutter a word she js looked at me and creepily smiled and its been going on WAYYY TOO LONG

And so I told her today that she HAS to stop with whatever sort of stuff she's been doing and she tells me she doesn't know what to talk about.. LIKE TALK TO ME ABT ANYTHINGGG, UR CAT?? WHAT HAPPENED LAST NIGHT?? WHAT U DID?? like I js want a normal convo w someone.. and I dont even bother making convos w her because she doesn't even reply and makes me feel stupid

And then It was during PE (I was getting changed thru all this 💀)

and she's like she's got changed and she's js staring me down and like just STOOD THERE like GO AWAY CAN U NOT SEE IM TRYNA GET CHANGED?? and then I told her abt how she gotta stop her staring and following habit and she's like "ok.. but idk what to talk abt so."

And she js stops there and after that OH MY DAYSSS I think ill acc lose my mind at this point WHY DID SHE ASK ME SUCH OBVIOUS QUESTIONS??

"whens our test?" WE GOT AN EMAIL ABOUT IT AND UR ALWAYS CHECKING UR EMAILS, I KNOW U KNOW.

"how long r the next holidays gonna be?" girl.. TWOOOOOOOOO WEEEEEEKKKS its always been 2

So fed up honestly 😭😭 and I'm dealing with other girls who had a whole tantrum js bc I dont wanna give them my new number like get away from me I barely know u