The worst thing about liking a girl is that the more you like her, the more the thought of her rebuffing you is awkward.
But she is just a person, like you, and she may even like you, and be too shy to notice.
As advised, be natural, she will be nervous as well remember.
Keep the conversation nice and casul, and if you get the feeling she is uncomfortable, then keep it brief.
If you are getting good vibes, ask her if she'd like to meet for coffee, and if that goes well, you can take it from there.
The worst that can happen is that she is not interested, but you wonn't know until you get that first conversation going.
Good luck!