Use the enter key to spread out your paragraphs please
it makes these easier to read.
You definitely had attraction and making her laugh is always good. You brought fun into her boring evening at work which is good too. I'm not sure based on your post how much comfort you had the chance to build. This would dictate getting to the in venue lay.
Depending on how receptive she was to kino, you could have just kept escalating and figured out where to take it.
Personally, I would have tried for a bounce. Its late and the theater is about to close take her to a new venue with you. The "instant date" and getting her to bounce is a key to getting her to try and bounce to your place. But even if that doesn't happen you have already had your first date in a way and can continue from there.