My experience of lady pilots under training was that, apart from a small minority who were never going to make it (much as some male pilots), they would usually be much keener to do well than their male colleagues. Say to a bloke "That was an average trip" and he'd think "Good enough - I'll go to the pub tonight"; say the same thing to a lady and she'd think "I can do better than that!".
We had a very 'girl-shaped girl' who flew excellent aeros and formation and had to choose between the RAF and the airlines, having had offers from both. She now graces the flight deck for Britmidlandish Internationalbmi!!