@nprofile1q... I am unable to answer the question you asked, as I have little to do with MO. Too snobby for me. However, I can bloviate ignorantly on why I think MO is not attractive to women:
The structure of MO (and SO) is to gamify mathematical problem solving as an incentive. Asking and answering questions builds "reputation" which can be compared to others, resulting in a game where the competitors jockey for higher rankings. I posit that this incentivization holds little attraction to most women. The dominant cultural paradigm is that men compete and women work together. In order to make a system like MO appeal to women, I would suggest that a solved problem congratulates everyone who helped, no matter how small the contribution, and no one gets brownie points to collect.