What is she trying to say? or not say?

theres this girl, and i hung out with her on monday last week. this was cos i was helpin her look for a shop, anyway on the way bak home i asked her if she wanted to watch a movie wit me and a few other frends on thurs. anyway she said shed call if she'll go, i had the impression that she will go. anyway thursday came and she didnt call, text, email or im. i kept sayin hey on im but she never replies. on thursday i sent her a message askin if she was still comin, she didnt reply. wat does this mean? does this mean she doesnt like me? i know shes tryin to avoid me cos thats obvious but is she tryin to say she doesnt like me or wat? and dont answer 'just ask her' cos i rarely see her and i talk to her mostly on im or sms. should i ask one of our mutual friends wats goin on wit her? i like this girl and would like to be more than frends but im happy just bein frends. anyway any answer/opinion is welcome