This doesn't apply to the current situation where the cat is out of the bag, but the broader philosophical question with a TG person joining a women's group is if that person should *ever* acknowledge their gender status as anything other than female. It seems that doing so simply gives the one or two hateful people among them ammunition to use against the TG.
There are a lot of GGs out there who have masculine features. In the rare case that their gender is questioned I'd think that they would cut the question off rather abruptly, likely with a bit of "how dare you!" outrage of their own. They have no choice, since they _are_ the gender being questioned. That would very likely cause them to immediately prevail in a social organization where nobody has any right to ask for documentation. A TG could do the same, provided that she has the chutzpah to stick with the assertion.
