I love that story..The nannies in my opinion get away with too much, one left my baby in his dirty nappy for hours and only changed it just before mum and dad got home, but you can't do anything to them. They walk out as if they are the epitomy of good parenting. And get paid.
I had a real-life daycare provider do the same thing. I always wondered why my daughter's diapers weighed 100 lbs. when I'd pick her up. I started counting the diapers I provided when I dropped her off, and the number was the same when I picked her up.