How to tell if a girl likes you eve while giving attitude?

theres a girl i like we never speak in person but alot on msn she acts shy in person but seems to be rude and extra on msn and i know shes not like her friends i think her friends are just putting **** into her head and are controlling her bcz shes not rude or extra to me but on msn she said that shes rude so don't bother trying to talk to her but in person she looks at me and looks away when i look at her she seems to have no problem at all talking to other guys but she always acts shy around me but on msn shes rude as hell she even asked me one time on msn why am i so strange she asked why i walk with my head down and why i look like i have low self esteem so this girls been looking at me. she even tells her friends about me and there was one tim eon msn when we got ina a fight and i asked her if she dsnt like me then why does she bother to tell her friends about me and she said(bcz your a joke) and i was thinking that aint a good enough answer she always acts like im not good enough for her but in person shes so shy i even remember one time when her friends tried to get her and i to talk and she was shy as **** but on msn shes always telling me to give up and what not. anyways there was one time she asked asked me to add her on yahoo and download songs for her she asked me twice for songs and i asked her who else does she ask for songs and she said no one just me so i asked her why dsnt she ask her friends and she said she dsnt know mabye shes just useing me for songs but idk and in person one time she asked me for a dollar and i was wondering if she really just wanted a dollar or if she was asking that in that crush kind of way like when i guy asks a girl for a quater ever freaken day but anyways ye shes very diff from other girls shes just picking up from her friends and being rude to me on msn only but in person we never even really speak i get too nervous and since she dsnt like me why hsnt she blown me off to my face already well i start most of the msn conversations anyways. i just wanted to know if shes playing hard to get or likes me or dsnt like me at all sorry for giving out so much info i just wanted to tell u as much as i can remember so mabye you can help me find the answer to all this