It's hard to exclude a child that may or may not be sick.

However, if one is sick and staying home then why can't the other one stay too? It would be logical to keep both kids out of care. This is another reason why I don't charge then they're sick. I don't want anyone coming just to get their money's worth. Kids get sick, it's part of the deal. The part that sucks is that from my experiance, it's takes about 2 days until the next one is throwing up.

I think you were right to explain it like that to the parent. Very honest. You can bring her, however, if my kids get sick in 2 days I close which means no daycare for you. Get your back up care ready.