Mara was Kang's science officer. TOS fans tend to fall into the habit of assuming that science officer and first officer are the same post, but that's not usually the case.
I suppose she could have been FO but it was probably unlikely.
Still she did boss Klingon men around and that was something lacking from the rest of TOS.
I remember in TOS there were quite a few alien species ruled by women. Maybe its only Earth type cultures who are sexist in the future of TOS
And of course you have Vulcans with TPau and yet Amanda 'obeys' her husband and TPring becomes the property of the victor.
Sorry strayed off topic a bit there.