I girl I like ignored me on BBM(blackberry messenger)?

I like this girl. She thinks im really funny but i dont know if she knows i like her. i try to talk to her on BBM(blackberry messenger)...she usually answers and replies to me. however, tonight we had a little conversation and i finished it up with a statement she ignored. i saw that she ignored it by the little r that appears on the blackberry screen. i tried to revive the conversation by asking what she did tonight and then she still ignored me once again. what can i do? is there anything i can do to make this girl like me? btw she thinks of me as a really good guy friend. i really want to try to kiss her this summer or like makeout. please help.