I'm so sorry for the family.  She deserves to know the truth and the daycare should be held accoutable for violating so many regulations. Has the family considered talking to a personal injury attorney for a possible civil suit? Proving a causation may be challenging but it may still worth considering with experts' opinions. If a case is filed, it might help the family to have an access to the information and documents related to the case as well as deposing all concerned people.