The trainer would have been able to tell you because (s)he actually saw it. "Bowing her head down" could be any number of positions, each meaning something different -- from proper collection, to low headset, to misbehaving, to stretching, to evading, discomfort...
No, it doesn't have anything to do with the sex of the horse.
I know my guy will do it sometimes after we transition downwards to a canter to a trot or a trot to a walk. For him it seems to be a stretch and a mental relaxation thing. Another horse I did lessons on loved to stretch his head down while he was trotting. It was an allowed release from being collected, but he had learned to ham it up a bit too. :)
-relaxing or stretching
-uncertain of footing or going over obstacle
-getting ready to lay down or buck
-trained as in western pleasure to carry it's head low
-loss of attention or looking for something more interesting than what you are doing
-looking for something to eat
It's hard to say why she is doing it without seeing it. No it is not because of gender.
A horse that carries it's head high is usually alert, nervous, or anxious. It could be also from its breed. A lower head usually means relaxed, which is good. Posted via Mobile Device