Mt Holyoke includes everyone but cis-men. I think they are the most inclusive of the seven sisters (excluding Vassar obv.) The other sisters excluding Barnard have a range of policies which is why it’s important to read them. Usually it’s something along the lines of cis women, trans women, and non-binary who feel they belong in a women’s community all OK.
All seven sisters have lots of non-binary students and professors, but the vast majority were born female, I would guess. I’m less familiar with policies at the other women’s colleges, like Scripps and Agnes Scott.