Why would a girl do this?

So i was at the bar last saturday night and i was talkin to this cute bartender and we were talkin for like an hour joking around and just having a good conversation and i brang up the avenged sevenfold concert this dec and asked her if she wanted to go cuz i didnt have anyone to go with yet and she said sure.....so a little later i asked her again if she was serious just to be sure and she said yea again so i asked her for her number and she was hesitant at first but gave me it anyway, so i called her last night (tues) for the first time and she didnt pick up or call me back i left a message sayin i was just seein what she was up to u kno i forgot to leave my number but if she was interested im sure she could of just looked it up on the caller id....it was her number too she didnt give me a decoy, what should i make of this? should i text her or sumthin was she just agreeing with me for the hell of it? im so tired of getting rejected im not ugly i just cant seem to have any luck lately or sumthin help!