I haven't studied it, in particular, but I would point out that they have two parties that are led by women, which would obviously encourage women to feel that they could legitimately run for office.
You also hate to say this, but when an election is skewed to centre and centre-left and left parties, you tend to get more women elected. The Conservative Party does tend to lag in the number of women who are nominated and who are elected. Depending on which parties win the most seats, you tend to get more women.
I'm not here to say that proportional representation is the only way to increase the number of women elected, but I am here to say YWCA Canada supports that. In many countries that are similar to Canada, it has increased women's representation and normalized the much higher level of representation of women.