You just need some confidence in yourself. What has she done that makes you care so much about her? I know she didn't go on a date with you, so that's out. I know she didn't sleep with you, so that's out. My bet is that you barely know the woman, since you didn't even talk to her.
You planned a move for 2 weeks. What kinda move were you planning? A dance and a twirl around the office? Man, you're a man, man up.
Instead of whatever two week plan you had in your head, do this. Walk in, say "Hi." Keep a conversation light and funny going. If you can't handle that, I don't know how you would handle that on a date. Then say you have to go do some work and tell her to write her number down.
If she rejects, she doesn't like you anyways. Rejection is your freedom in this case. And it's holding back a lot of your freedom. So you get the number, you call her up in a week when you're FREE. Not planning a date for a week, go out and do stuff for a week. Call her up, schedule a date for a few days later, and then go on the date and kiss close her.
The point of all this is to either get rejected or accepted. Both ways, you know either to move on, or take your chance. Remember this man, if she gets you, SHE'S LUCKY TO HAVE YOU. Don't think of her as so special before you even date her, then you're just glorifying her existence and it's going to ruin whatever chances you have in the future.
She is not better than you. So cut the crap and get her number and ask her out. Do you want to see your arms around her next weekend or the jackass who had the balls to make the move all over your girl?
Good luck.
-- because I'm more happy knowing that there's that possibility than knowing that there definitely ISN'T! 
