Honestly at this point after lie #2,3,4 etc. I'd demand a Dr.'s note saying that he is A-OK and no longer contagious around other children. WITH THOSE WORDS.....if he's had 5 loose stools in 90min that's not OK! And a good Dr will see that and tell her!

You know what, After that many diapers and days of being sick I as a PARENT would go to the Dr anyways because that is a sure sign that something's off. (eye roll at stupid parents)