That you are paying for a time slot as well as childcare.
That your CM is not being grabby if she charges you in full when you decide that on a particular day you don't need all the hours you agreed in the contract.
That your CM is not being mean when she charges you when your child is unwell.
That your CM is not being jealous when she charges you when you go on holidays but she is still available to work.
That your CM is not being unreasonable when she charges you when you are late.
How can this be explained better so you can understand your CM point of view?