Why editing
Of course, there were exceptions. There were two women in the prewar Netherlands who directed films: Caroline van Dommelen and Adriënne Solser. Van Dommelen had made her career as an actress; she directed three films in the early 10s. Revue artist Solser took a more ambitious approach: she set up her own production company and directed a number of film farces in the 1920s, the ‘Bet films’, where she also played the title role.
But they were exceptions. So women were not quick to come to work as directors.
Editing however had a lesser status, as it was seen as work with little artistic value. This is reflected in the credits: until the mid-1930s, the credits on the film reel were often limited to direction, production and camera - occasionally extended to include the name of the set designer.
And there were other factors at work in favour of women editors. Editing required patience and accuracy - qualities that were seen as typically feminine. More pragmatically, editing was labour-intensive i.e. expensive work, and not too physically demanding. Considering this, it is not surprising that women - a cheap labour force - gained a foothold in film editing relatively early.
This is not to say that there were no male editors: quite the contrary. The majority of Dutch feature films from the 1930s were edited by a man: Oscar van Leer, Harry Ankersmit and especially Jan Teunissen edited many feature films.