One of my classmates is looking at me, and what should I do?

Hello. I'd like to ask question to you guys. In my class, there is a student who is always looking at me. Firstly, when I noticed that she was looking at me, I thought "Oh, probably she was daydreaming" But again and again, I catch her looking at me, and she looks really serious (no smile or no emotion). Now it bugs me why she is doing that, and I want to find out why she is doing that. Should I tell her that "why are you looking at me?" If you can advise me, could you advise or help me, please?



when you catch her looking at you just stare back with a "Do you have a question?" look. Not a mean one. See her reactions if she looks away or if she smiles.