"We pay her a great wage, plus overtime..."
"We've had to take time off to cover her absences and pay for temporary child care..."
What you say is a great wage is your opinion of course. So that's a moot point. And the fact that you're bragging about paying overtime just baffles me as this is required by law, not a job perk.
So which is it? You take time off when she's absent or you pay for temp child care? You seem to be putting all you can out there to sound like a martyr and something about your post as a whole just wreaks of exaggeration.