I would say any chores a Nanny completes should be related to the child that they are caring for.
Sweeping and/or vacuuming would be included if the said child made a mess on the floor.
Otherwise this is not part of the Nanny’s duties.
Other chores could be emptying out diaper genies/pails, washing/sterilizing baby bottles + washing child’s laundry.
(Though I personally think Nannies who provide laundry services should be paid a higher salary!)
Washing any + all dishes used during a Nanny shift as well as picking up all toys/books/puzzles/etc. should ALWAYS be done prior to the Nanny leaving.
Hope this helps!
