It is easy to talk to a person that you know or are familiar with - but not neccesarily to a person you fancy and interest in. It is important that we should find our courage in such circumstances and allow ourselves to be comfortable in our own skin - easier said than done?
Well, when it comes to speaking with someone we fancy, we often are afraid of miscommunication- and this is when we keep thiking of what to say right and do right - which in many cases, spells for awkwardness and an unnatural approach. Simple then, stop thinking about what you should say to her and start thinking about what she says to you - When a woman speaks - she is usually hinting more than what she says. Try to analyze what she says and respond in a way that you understand what she meant.
She could say anything just to get your attention - that is if you are shy and require a kickstart by her. Not to worry, she is probably thinking the same if she likes you equally. Still, it sounds like alot of analyzing. Ok, how about this : write her a letter and sign it off telling her to reply with a letter as well. In this way ,you'll get to communicate and relay more information to her in a more passive way-
In fact the best way of course is, find out what she likes. Color e.g, animals. it could be well anything under the sun. The more you think of what to say, the more it is not going to come out- play your chances well if you are the type who doesnt talk alot - write her a letter - well some guys are just excellent in letters, it could be so for you.