Hi rcat,
No it doesn't sound crass

A support group is there for support and you've a right to expect that some support should be offered..........but when an individual takes away from that............
So could you talk to the moderators about how you feel and about putting some clear or
clearer group rules/guidelines in place.........although if they're already there and she's overturning them then maybe you could complain to the moderators about her??
Or maybe there's a group member you could talk to, who might
actually feel the same but be more likely to speak up to her or the moderators if they know "they're not the only one" who feels like that??
Otherwise if those aren't options, for now, the only other thing I can think of is trying to change the way you see her........if you can (!!)........e.g. you're seeing her more in the position of control, power, strength (she kind of has a hold over the group and sometimes the moderators with her inappropriateness)............but perhaps if you see that "strength" as actually a
weakness she has, afterall she has trouble "fitting" in, upsets people, doesn't realise or consider her impact on people........that kind of thing.
So I guess I'm kind of saying, could you more try to feel sorry for her as a way of managing to cope with her???
Of course, I'm saying that not knowing what kind of triggers she's causing you, so I'm deeply sorry if that would be inappropriate in your situation.
Alison