From what I can recall of the dialogue, it wasn't so much that Martha was female as that she was black and spoke "common" that made Joan think that she couldn't possibly be a doctor.
Joan did go on to say about Martha being black but it was after mentioning that she was a woman. That was mentioned first, regardless of the emphasis. And I think that someone who is a nurse would know that that there were already women doctors, and had been for quite a few years. Some people get annoyed about the science or lack of in SF; I get annoyed when women's history is overlooked, and especially when attributed to a character who could be expected to be aware of it.
Our recording didn't record (we watched it live) so I couldn't go back and check. If I heard it that way, I must have taken "may" as implying "in the future".
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