The loudness of a club actually works to your advantage. In order to carry on any sort of conversation you guys need to be in each others' space. Don't try to shout at her from a distance, get close and talk in her ear (once you've established basic rapport of course). When you're done saying your piece or asking your question pull back. If she tries to talk to you normally, point your finger to your ear like you can't hear. Lean forward a little bit so she has to move to your ear to talk to you. This closeness opens you up for all sorts of kino options that you wouldn't have in a normal volume setting.
Oh I think it needs to be said, in a loud club even if you're right in her ear you still will have to project to be heard properly. Speak from your diaphragm and not from your throat (you'll end up hoarse by the end of the night if you rely on just your throat) and she should be able to hear you.
~Antithesis