Blimey, i really think you need to email and phone the agency and i would take the ironing bill out of the temp nanny's final weeks salary.
It is appaling behaviour on her part.
Today while caring for a 4½ week old baby who wasn't due to arrive until NOV 5 i have got up twice to do night feeds, done 2 steriliser loads, done 2 small loads of her washing then dried and put them away, wmptied the nursery and kitchen bins, helped mummy take her out for the 1st time in the pram navigating stairs and lifts (1st time mum) since she came home friday, helped mummy rearrange the nursery furniture and we shared bathtime, am currently minding her as the grandparents have taken the parents out for supper.
So as far as i can figure your nanny has possible got the dc up, supervised dressing, done breakfast, ensured teeth cleaned and driven the dc to school in total silence then driven back to the house then done sweet FA until it was time to drive to school to collect the dc and given them a poor standard of meal and then what!?
Now granted as a Maternity Nanny i earn a bit more (ok 50%) more this week than she does but i don't work/get paid for 52 weeks a year, babies being unpredictable in arriving, but i for sure know who actually earns their wage at the end of the week, oh yes and i do 24hrs a day for 6 days for that additional 50% which is then taxed!