Hi Sunnit,
Be careful that you don’t misinterpret a form of behavior as a sign of interest.
If she notices other people in the same way that she notices you, it is unlikely that she likes you specifically in a romantic sense.
However, if she only tends to notice you through constant staring in your direction, there is a good chance that she does like you.
In a scenario like this, it is actually better for you to let her know that you have noticed her through looking back at her, instead of trying to make it seem as though you don’t notice her.
Establish eye contact with her and smile as often as you can.
This will make her feel more comfortable with the prospect of talking to you.
This way, when you are ready to talk to her, she will be a lot more open and receptive to you.