seriously, u need to make her feel that she is comfortable
talking to u...
and it takes real practice to do it ba 
well, u can start by talking to her and asking her likes and
dislikes and the things she loves to do. if u wann create a topic,
u needa see what she's interested in, and u guyz can further talk
about it. for eg, the korean drama goong seems to be a very popular
topic nowadays, so if u know that she's watching, u can ask her
about her opinions, and afte sometime, she will get to know u and u
are able to communicate with her anytime 
tried that, did that, and it worked