Ok this is from a newer National MCGLO, member of NMCG (which does not govrern such things, yet)
I know we don't have any specific provisions for this in our bylaws but we do frown on accepting women who have deactivated from other orgs.
That being said I know that some ppl who eventually end up having gender reassignment struggle with their identity and how to identify themselves. So if say an 18 yr old freshman was struggling with gender issues and pledged a fraternity in an attempt to fit in, then as a 24 yr old graduate transgendered woman decided that she loved greek life overall but needed to find a sisterhood, since she is now a woman and can no longer participate in greek life via her frat wanted to join, idk what would happen. I don't know if ppl change their gender and never look back or if they tend to be more open about their past life, because why would you share something like that knowing it could keep you out of an org? There are some things that you should not tell if you can keep yourself from being discriminated against.
My personal thoughts, don't tell me you want to be my soror, but ask me to call you brother!