Girl At Work
Take one moment at a time.Focus on your professional tasks so your sincerity and honesty will be seen by her.Be polite and helpful.Exercise well.Be ready to resolve issues so as to show her your maturity.
Do not crack silly or crass jokes and should anybody else does that and she doesn't laugh , do not laugh.
If she sees that you have a lot to share that also will be helpful so know in a subtle manner what she likes.
Unless she is interested as well, you can't do much.No desperate attempts to impress her.
Why not ask her if she'd like to have dinner sometime. You know this great place....
And use your knowledge of what she likes to pick a restaurant that has the best of that thing.
Understand rejection hurts yet not near as much as realizing she really did like you when she is seeing someone else because you never risked rejection.