You have mentioned that parents are not concerned about the number of children in care. The provider doesn't seem to be hiding things from her clients so there is not really much for you to do about it. Parents have made the choice to place their children in her care.
Sandbox Sally...your example is very different, you saw a provider neglecting children. Obviously she does not tell clients that she plans to ignore their children and put them in danger. They have not chosen to place their child with her knowing she would put them in harms way.