that really sux that she doesn't want to take you clubbing. yes maybe she likes to hang out with the girls and just dance away without feeling like she is doing something wrong, but once in a while it would be fun if you guys got together and went out. maybe you act jealous around her at a club? if you just ease up maybe she will realize that you trust her. Also if you guys go out, give her space within that context. go dance in a decent way with other girls and let her do her thing. after a bit go dance a few songs with her.... yunno? my boyfriend and i aren't big clubbers but when we do go out we go with friends (as in his friends and some of mine) so there is a variety and its fun all around!!!!
i'm probably not that helpful, but you seemed like you really needed some advice. about her being less shy with other guys.... how long have you been together, and how close are you? maybe she feels shy around you because she has to worry about not making you worried that she looks like she is to close dancing with other guys. give her space but show her that your all about having a good time too... not just controling her.
xnatx