well, i doubt it really is big enough to really be noticed but you can look at it 3 ways..
1) she doesent like you and finds you repulsive..when she got your mesage she got creeped out and didnt want to talk to you and when you asked she didnt want to hurt your feelings...
2) she likes you a lot and she was to nervous to call you back and when you asked she didnt want to admit she had cause it would have made her look shy.
3) (most likely) she didnt really bother listening to it cause she is lazy and she didnt realize you left her a message.
in my opinion, i wouldnt have asked her if she had recieved the message. its not really important to know and it makes you sound like your really concerned about it. also just to let you know, your making way to much commotion about this..lol just forget about it... dont wory about little things.. i know its hard sometimes to just ignore them, but more than often they are just pointless reactions..
to help you understand this, try picking a random girl who isnt hot that you see often who isnt a really good friend or anything , and assume she is crushing on you badly.. now, with you acting the way you normaly do see if you are sending ANY little signs to her that she could possibly intercept that youl ike her.. you will find a lot of things that you do that other girls do to you that you may think is valuble info, but its not... now find a girl you like and just act the way you do normaly... you may liek her but just look for things you do that can maybee intercepted as a signs you dont like her.. if you can pay attention to yourself you can see yourself giving negative little signs without even knowing your doing it eventhough you may like this girl... so if you can understand anythign i just said then go try it, it will completely make you ignore little signs. ...