Anonymous
Many parents will give priority to their child's needs over their own. It's the kid who has to suffer with rotating caregivers. This comes as an unfortunate cost of doing business, I guess. But the more often you do it, the bigger your risk of major problems with your child's healthy development.
You have a good point but the wrong conclusion. If this MB needs to replace her nanny, it's because the nanny violated the contract. If nannies really care about rotating caregivers, they should follow their contracts and be worth keeping.
If a nanny is inconsiderate and violates her contract, well, she should be fired and replaced by a nanny who cares enough about a child's development to actually do the job she agreed to do.