How to use "mistress" in a sentence

The mistress of the house would come in and find me, a stranger, sitting at her desk.

More like a servant than the mistress of Manderley

I could never be the mistress of Manderley

Dr Goodricke registered the death, and my mistress made all the arrangements for the funeral

The dead lady's husband was out of the country, so my mistress arranged for the lady to be buried in her home town in Cumberland in the same grave as her mother.