The bees (like the ants and wasps) are hymenopters. The sex determination and matting habits are very different of used in mammals (and in particular humans). So a female is more related to her sisters than to her own children. Then for her it is preferable to help her mother to have more female offspring. (This behavior is determined genetically, not a "free" choice of each individual.)

So it is not a good idea to try to extrapolate the ideas of how a society should be organized from bees, ants or wasp to mammals or humans, or vice versa. (Like in the movie "Antz".)

http://en.wikipedia.org/wiki/Hymenoptera#Sex_determination