I don’t know, but I would lay pretty substantial odds that half or more of today’s techie women got there the same way I did. No teenage hackfests, no college CS major, no certifications, no 80-hour coding death marches. Just something needing doing, and a woman willing to cuss the computer until she figures out how to make it do what she wants.
Some accidental techies are indeed male; I know one or two. I do wonder about the distribution, though. The accidental techies I know typically came from pink-collar occupations, and how many men does one find in those?
I wonder about some other things, too. Do accidental techies get paid what their jobs are worth? (I have no cause for complaint there, I am glad to say.) How many of them feel as much an impostor as I do? What do the intentional techies think of them? Do they ever learn all the in-jokes? Or the acronyms? Would they advise others to sneak in the back door the way they did? Is it even possible to plan to do that, or does it always “just happen?”