Women in the Mafia - yes, I wouldn't put it past a few criminals to use their missus in a few things. But by what the public knows by the proper government authorities, there is no knowledge of any "made" female members inducted into the American Mafia.

Goodfellaoggies link was a good link into the Camorra of Southern Italy. Mostly Naples. They have a local version of the Mafia there and what news has told us is that women have been highly valued there. Being involved in actual hits and i've heard of some women being involved in the administration of Families. Sometimes even controlling the organisation themselves.