People discussing the so-called gender gap* in software engineering education always forget a "little" details: learning to program takes a lot of time and dedication. Basically, at least two/three years of 10 hours+ a day (university classes and homework, plus personal reading and projects). Most of this time is spend alone, behind a computer. Very few people are willing to follow this lifestyle, girls even more so because of the lack of face to face human contact it implies.
* which is not a real issue anyway: the software isn't worst because of the lack of women creating it. In addition, the same people are totally fine with 80-100% girls in language and humanities degrees which means their real goal isn't "equality", which is reached already because universities don't select people and education is free (speaking of France here; we hear the same gender-gap bullshit).