She probably just wanted to create a convo Unless she’s a rando on the street or someone in a completely different year to you I would be concerned
Ok could she likes me and that was her way of getting my attention like I’ve noticed in the last few days everytime she came by my locker she always told me hi idk lol
You don't know what her feelings are towards you (i.e. does she like you or just being friendly, as said previously). Even if she did like you, you can still blow a good thing by coming on too strong.
As @Admit-One said, just talk to her, find out about her background, ask how her exam was... and maybe see if she wants to hang out sometime / somewhere when the exams are finished.