It's a dreadful song. It never even occurred to me that it was somehow empowering to women. I just viewed the story as a desperate mother tossing her daughter to the wolves. Was the mother even married to the father(s) of her children? To come up with prostituting her own child seemed more like a cyclical situation in their family tree.
Never heard of it, and my opinion of Bobbie Gentry has changed 180°.