I don't believe in democracy. But I don't see why voting for a woman is a sin. I also don't believe that a woman cannot be a good ruler. I can mention "Isabella the Catholic", or "Isabel la Católica" in spanish, queen of Castile, as an example of a good female ruler, if you are Mexican you should know who she is.
The problem in my opinion is masonic liberal democracy. But, if I'm not mistaken, voting is not a sin, even if this "democracy" is rubbish.