You are like a child. I cannot trust you out of my sight

You are like a child. I cannot trust you out of my sight. No sooner is my back turned than you get that little minx Marie to sell the silver salt-cellars.
(a) Why did the listener get Marie to sell the silver salt-cellars?
(b) The word ‘minx’ as used in the extract means…
© Why did the speaker not want the salt-cellars to be sold?

(a) The listener got Marie to sell the silver salt-cellars as Mere Gringoire needed the money to pay her rent.
(b) clever girl
© The speaker did not want the salt-cellars to be sold because they had been in their family for years.