1)Maybe she did like you, but you left it 9 days to go back and ask for her number. You should have gotten it the first night while you were fresh in her mind. You didnt tho, you left it 9 days which is a lot of time for her to meet other guys at work in the meantime and for her to forget whatever good impression you may have made on her - you became a nobody.
2)Once you got her number you told her you were going to call which made you predictable.
3)she blew you off and you didnt call her on it.
1+2+3 = a predictable nobody who aint man enough to call her up on fobbing you off.
So, is it any wonder she isnt interested?