I recently suggested that you keep an eye on the GOP primary in Illinois's 10th congressional district, for an early sign about the prospects of actual Republican women getting elected this year. (BTW, Hotline chimed in on that topic today.)
Well, the woman in question, Elizabeth Coulson, has just conceded defeat to businessman Robert Dold.
Obviously no single election is definitive proof of my theory of the extinction of the elected female Republican. But, I think it's a significant piece of evidence.