Etiquette: You are not living with your parents anymore

Your boss is not your mother, it is not her job, to cook, clean, chase around after you, tell you to get off the couch and all those other jobs that a mother does.  Your boss is not your maid, cook or housekeeper.  Your boss employs you to do a job; she pays you money and supplies you with accommodation and many other perks. 

This is one of the few jobs in the world where employers provide personal accommodation and living expenses, so show appreciation by asking if she needs a hand or finding a regular chore for you to do to repay this.  You need to contribute to housework (not do all of it - just to contribute) to compensate for your own presence in the house.