I think my policy says that at number 3 they are called. I did have 1 time where a 3 year old had diarrhea and pooped herself so bad where I had to put her in the shower and hose her down that I called mom instantly. If it is so bad that she can't make it to the bathroom I certainly didn't want to have it happen again. Little ones with diapers are a bit different.

IMO the mom shouldn't have even sent the child to daycare seeing she had diarrhea so much last night. Poor kid could be dehydrated. If it happens again I would call mom to pick up and tell her that she needs to be diarrhea free for 24 hours before she returns to daycare.