i don't think women suffer from any kind of physical impairment that would keep them from engineering. they have ears, fingers & the ability to make judgment calls.
-you could break out the "old boys club" argument.
-it's a numbers game & since less women are involved in rock music, fewer would make their way behind the glass.
-there's the WNBA assumptions that the girls league is lesser. (sure they can make a good layup but they cant dunk)
-an array of scenarios regarding the reality of your average studio environment vs the temperament of your average woman. resulting in a flood of ego, emotional & technical aptitude related speculations that border on misogyny.
i think you can spend all day debating the nature vs nurture of it. but at the end of the day i'd think a woman would have a better insight as to why so few of her "sisters" venture into audio. any theories?