B.H.
Sounds like she's bitter your kids are leaving or in her eyes the money is leaving.
She didn't give you even a week's notice for her vacation and it's extremely hard to find back up care. Plus pay addnt'l for back up care. That is rude.
The county usually pays the provider for x amount of days for the month regardless of whether your child goes or if somoene is sick or on vacation. I know my daughter's daycare is closed next week to get ready for back to school and I believe they're still getting they're monthly payment. I wouldn't worry about her and I wouldn't pay her. If she's a daycare provider she should know exactly how the county works with payment.