It's also very difficult to go into a new small workplace where this stuff exists, as I discovered. And the hangover from that for me is that I am usually very wary of people who are overly friendly to me when I'm new because I wonder what their motives are and what team I'm being recruited to. Everyone probably thinks I'm a stuck up b!tch at first, ha ha. I'm older and stronger now but I've learnt a couple of hard lessons along the way.
OP it sounds like there is one major ringleader. What would happen if you invited the others out for a coffee so they could get to know you? Or is she too powerful?