Thats what I was thinking
/seriously though mate, just tell her how you feel, and go from there, by the sounds of it your half way there anyway so just go in, don't do it when your drunk either, that just makes a serious mess of things.
Just recently we had a new girl at work start, she seemed quite nice, prettly little thing she is too. Thought she liked me cause she kept following me round, being really friendly, bit of flirting.
So when I asked her out for a drink and she said yes, I thought great
Saw her before she left work that day and said hey look lets swap numbers whe she went all funny on me. She then ignored me for two weeks, but that wasn't enough she went round telling anyone that would listen that I was pestering her for sex !!
She's now got a boyfriend but was disappointed to learn that I'd moved on and was no longer interested in her.