As a trans woman, I confess that I have been wracking my brain trying to figure out what you are referring to here. Are you talking about transgender only spaces, such as peer-led support groups? As a facilitator of one such group, I have not heard of any group that is exclusive only to trans women. In fact, I am aware of such groups for trans men and non-binary people, but not trans women. Maybe I am being obtuse, but I honestly don’t know what else you might mean.