I think this happens in many airlines. In one that I know of well there was one Captain who could be relied upon not to turn up for a weekend nightstop duty. This is not exclusive to lady crews.
That said, if you feel you need more time off, perhaps you should consider a part time contract. I know the airlines don't like it, especially the locos, but maybe they need to think about it a bit more. Ultimately you have to think of yourself: the employers only think of themselves after all.