Translation:She is the lady of the house?
yeah, the phrase "the woman of the house" sounds a lot more normal to me than "the lady of the house." And "madam" is just weird all together.
It's not correct, though. It'd be the difference (however slight) between calling someone someone a woman; or calling them a lady, or ma'am. The latter signifies respect.
I thought 'woman' made the most sense. Madam? I suppose this will come in handy when visiting a brothel.