About 10% of my customers are women. My wife is a pilot as are three of my ex-girlfriends. Oh my gosh, there's a pattern there....
In groundschool their abilities range from the brightest to the slowest, just like the blokes. There's no discernable difference. They do have to put up with extra banter, but mostly they give as well as they they take.
My two penny worth - Female pilots generally don't take their ego on the flight deck (on the button, Whirly) and by their presence tend to civilise what can, at times, be a bit of a testosterone-loaded environment. The ones I have flown with can't navigate their way out of a paper bag but have generally higher levels of discipline than their male counterparts and are mechanically very competent pilots.