Earlier quoted context omitted.
That explanation doesn't match the chart: There weren't a lot of women in CS. They were growing, just like other fields. And then, suddenly, they stopped growing and started declining.
It did rise most sharply in CS because it was open to women early on when women joined the labor market (previously either holding non-degree jobs or being stay-at-home wives). Once other fields opened up too they left CS for those fields which aligned more with their interests. Maybe there might be two effects at work here: Women joining a field early that was seen as a female job (computer secretaries) that did not…
Again, that doesn't match the chart: http://www.randalolson.com/wp-content/uploads/percent-bachel...