Interesting question, without getting involved in the rest of the discussion but rather focusing on the initial question I might have an answer or clue for you. Quite early on while I was learning and trialling on demo accounts and micro accounts I realised emotions are a big factor in trading. I quickly surmised that a higher EQ (emotional quotient) might be more important than a high IQ. Thus I realised trading should be more naturally suited to a feminine leaning personality. I thought my wife could benefit from learning what I am doing and I quickly and enthusiastically offered to teach her.
I was quite disappointed, she flat didn't believe she was capable, and I know she is fully capable. Generally I realised a lack of self belief stopped her even trying, she had no interest. I won't go into the details but generally she did not believe she could do it. I think the lack of self belief may also come from society, just looking at the very strong responses on this forum might be indicative of how society frames us and even makes us believe what society would have us believe.
So as to reasons why their are fewer women traders (and at the seminars I've been to, I've also seen a distinct lack of female traders, but they did ask all the good questions) the reasons may be to do with self belief, societal beliefs and pressures. Perhaps there is something that can be done to change this. Personally I would be well pleased to lounge on a yacht that my wife bought with her expertise than even having to bother about trading!
Slowly I will try to convince her again though, thanks for your question and good articles, it has convinced me what I know I should do to get a better living through trading!