In an effort to answer my own question about the history of women in computer science I did a quick google and came up with this article

http://fortune.com/2015/03/26/report-the-number-of-women-entering-computing-took-a-nosedive/

Some highlights.... pre 1970 women account for 10-15% of CS bachelor degrees. That rose to 37% between 1980-85 and has declined back down to 18% by 2013 (the last year of data). So contrary to your anecdotes about the founders of computer science the field as a whole has been dominated by men it's entire existence with the exception of a brief, 5 year period in the early 80's which coincided with the rise of the personal computer. It's possible that female enrollment has been declining back to the historical norms after a brief popularity spike.