I suspect that there are various reasons that "ladies" aren't that bothered about a career in flying. Firstly, they generally don't desire to do things with powerful machinery, unlike "gentlemen" (!). Secondly, if they are looking for a job in which they will be taken seriously, they will probably go for one in which they won't be referred to as "ladies", or patronised, or have to deal with men who think they're God's gift to the opposite sex because they wear a uniform, or have to deal with the fair proportion of pilots who are only half-joking when they comment about "another empty kitchen" when they see a woman professional pilot (though I've noticed the same men tend to be those who have a marked bias for preferring working with female cabin crew over working with stewards). Thirdly, they may realise that the job will basically wipe out their desire to build and maintain relationships with ... well, anybody, really. Fourth, the fact that they aren't captivated by the machinery means their eyes are wide enough open to realise that if they are intelligent enough to fly aircraft for money, they are probably intelligent enough to make enough money doing something else better paid with a less serious effect on the rest of their life.