If I was tasked with studying the gender gap in tech, I'd start where the tech workers start - in school. I'd go to the source and actually talk to students, male and female, in tech classes, and not. I have a hunch you'd find that students tend to go into fields that interest them. It's as simple as that. 

Tech gets a lot of coverage in the media, but as of 2015 it accounted for only 7.1% of Canada's economic output, and employs 5.6% of the workforce. Hardly a National crisis.