Well they are going to have to doorknock to find them. The issue is that flying is not attractive as a career except to dumb ass white males. Don't ask me to scientifically prove it but the fact that most pilots in western based airlines are white males is not because there is some discriminatory process, in fact aviation would have to be the least discriminatory as if you have the license and the hours and a pulse then you are all they want. The simple truth is females tend not to be attracted to the pointy end. There does not seem to be any shortage of female ATCers so aviation does attract females just not into the flight deck.