Thanks for the tip Capt. Jack!
This is a good reminder for us here - remember, not every girl is as confident and outgoing as we would like to be. Just because we have a list of "signs she is interested" doesn't mean they will tick them off and display them all when they're around you.
Like us (or previous versions of ourselves), they may also become shy, and anxious and try to hide their signs of interest. The best remedy, is for us to assume that she is, and seeing that you're comfortable displaying signs of interest towards her, might lead her to reciprocate.