Strange reaction by the club bouncers, did you just voice your objection or were things getting heated and aggressive?
Anyway, regarding your friend, well I would agree her reaction was strange. Maybe she was embarassed by the situation and didn't know what to do. Had you been my friend, I would, at the very least have gone out into the lobby area and phoned you, to say I was staying to see the end of the show, but would give you a call later.
The only way you will know, is if you ask her. Maybe she doesn't see your friendship in the same way as you do.