Why would you want your child cared for by someone who really doesn't want to provide care (for whatever reason)?
As a parent, I would be heartbroken to know my child was "supervised" only for the money.
I understand care is hard to come by in your area but Id search for a nanny or some other arrangement before offering to pay someone more $ when its clear the provider doesnt want to continue.
That's just a recipe for disaster if you ask me.