Hey Ignignaughty,
Your story is pretty much EXACTLY THE SAME TO MINE!!!!...except, i actually told the guy i like that i like him...okay, she sounds like she is acting the same as how I acted before i told my guy.
Okay, she sounds like she seriously likes you, and is definately hinting to you that she likes you, well thats my opinion anyway :S ... I'm just taking from thats how i acted, it's a definate possibilty that she is as scared as you are, and is terrified that you will turn her down if she asks you out, that was how i was

...
Anyway, if you like this girl, i definately recommend you asking her out, just start off slow, keep going to the movies, definately, but maybe, instead of just sitting with her, put your arm around her and see what she does.
When you say that she jokes about you two dating, thats what i always did....so i can relate!
But, if you like this girl, ask her out, or you'll miss your chance!!
I wish my guy would take my advise!!!
