S.H.
Since your children will be the only ones there, I would seriously consider a different provider. I would prefer my children to be with other kids, to be with a provider with current/up-to-date experience, to be with someone who's dedicated to her job & not just starting out (or starting again with kids).
The fact that she is undetermined in her fees ....is a red flag for me! What else is she just "winging" it on?
Should you decide to use her, please do not feel guilty or responsible for her income. She is responsible for this! Pay the going rate....& leave it at that. You are not in charge of her finances.....she is!