This seems to run into exactly the problem I brought up. Women in poor countries having higher status than men in the eyes of the West is not the same thing as the eyes of the West seeing women as worse off. If women are worse off then putting more effort into helping them may have higher marginal return than just helping men or helping everyone. What you've pointed to isn't good evidence for your claim.
It does not seem likely to me that this gap is entirely due to poor women being overwhelmingly worse off than poor men. Indeed, given the higher variance of men on a number of traits, it seems very unlikely to me that the worst off of men are better off than the worse off.
Given that "charity is not about helping," this discrepancy is more likely due to the status-induced motivated ignorance of philanthropists, than a rational cost-benefit calculation of where money can do the most good. (As a practical matter, I do think it's plausible that microfinance is more workable among women in the regions that Kiva has decided to target. But I don't think that's the motivation that shines through from the copywriting.)
This is interesting, I wonder if there's anything to it: International variation in IQ – the role of parasites (paper) by Christopher Hassall of U. Carleton.
It strikes me as the sort of thing that could be as big an issue as lead in the environment. Raise the sanity waterline: improve health!