In the 50s my granny was a housewife and a mum and handled all the family money as well as all the commercials for her husband's business. That would have been because she had a head for numbers and a good education whereas he - though my grandpa is a lovely person and has all sorts of other talents - was simply not very capable at this kind of stuff.
I'd also like her to meet the uber-competitive top dog in my very male dominated workplace. Yes, he makes enough money to feed not one but two families - he's also got the aggression potential of your average newborn pet hamster and is altogether lovely and generous towards his fellow men (and to women). How exactly he managed to make it to the top in this supposedly dog eat dog world remains a complete mystery. He probably killed the competition with kindness until they literally dropped dead.
Seriously, though, if that's what she wants to do, by all means go ahead (though It seems slightly insane to want such a lifestyle). I have issues with her generalizations, though. There's a lot more projecting than actual understanding of historical or present conditions going on here.