Be her own mistress - Idioms by The Free Dictionary
be (one's) own mistress (redirected from be her own mistress)
be (one's) own mistress
Of a woman, to not be subject to or controlled by others, especially at work or at home. I have to be my own mistress, so I couldn't work in a big company like you and have to answer to a boss.
be your own ˈmaster/ˈmistress be free to make your own decisions rather than being told what to do by somebody else: There’s no point trying to tell him what to do. He’s his own master, as you know.