A girl can like a guy in many different ways, in a manner of 'degrees' if you like. At first, you just need her to like you enough to talk with you. That's your starting point. The easiest way to know for sure she likes you enough to talk is to make an effort to start conversations.
In this article, I listed 26 clues that a girl likes a guy. If you couldn't find any that match your situation, you have a pretty big challenge ahead of you, but there's no reason why you shouldn't speak to her and see if she's willing to chat back.
But you need to remember she might not like you because she doesn't know you. If you want her to like you, it will take some effort to make contact and give her a reason to think you are likable. It will probably take quite a while before you know for sure.