I know a lady that is good in trading but I think she is just the good trading skills as an exception and not general to all ladies.
Also most ladies are not trading. Men are the ones that you will see most in trading.
Successful traders that I know but which I do not know if they have what they are doing underneath are all men. No single lady among them in my country.
Any lady who involves in trading must be a very strong lady because the stress of monitoring the market all the time is something that most women wouldn't like to engage in since they like soft life and not things that will stress their brain.
Just as you said, majority of traders are guys and men make better traders because they create time for things that makes them earn money even if it will take them being indoors the whole day. Most women are only interested in getting money from men so i doubt if a large number of them will find trading worth their time.