You usually need at least 15 minutes to get a reliable #close. You aren't going to get anywhere near that while she's working a busy nightclub. She may say "Yeah, let's do that" and then not return your call.
Logistics are working against you. I would change the logistics by talking to her when she's not busy (the beginning of the night), or where she's not working (find out what spots she thinks are cool), or I would take my chances with
direct game.