Some bad advice from the lads here. You have to apply basic psychology in a situation like this.
So the Op was doing okay and the gal told him plenty of times she found him attractive. That is all he needs to know.
An email isn't going to work. Call her at work and explain how the bouncers weren't letting anyone back in. If she is
at all interested you can make another date. Otherwise, tell her you didn't want her to think you weren't interested.
It isn't stalking because there is no intent to do her any harm. People distort that concept. It is still the man's prerogative
to make the first move. Women get turned on thinking an attractive guy wants them. Guys don't feel the same until they score.
Let us reverse this and suppose the gal had to go and couldn't get back in. Would any guy think she was stalking if she contacted
him at work via email or a phone call? Heck, no, the guy would feel that he had what it takes. There you are.
A romantic guy might send her flowers with a nice note!
Good luck.