Yes, girls are also doing gambling with bitcoin and I know some of them personally which are doing this fun thing to make some money for them, I think girls are more lucky than men because they are making good profit on gambling site.
I don't think so my girlfriend is really unlucky in gambling i have allowed her to play some round in bitcoin dice but she lost quite high than i have expected. However there is no any relation between luck and gender, luck is always luck and i think girls also love gambling just like boys if they know about online gambling. And with bitcoin casinos it is even easier for anyone to remain anonymous during gambling so no any gender, age or country restriction.
Gender doesn't really matters at all in gambling - if it does, I would say that there are quite number of girls out there that have more bigger balls than men when it comes to betting and risking big amount of bankroll. The sad part is that, there are many losers out there in gambling irregardless of gender. Play safe everyone and play only an amount of money that you can afford to lose.