My condolences to the family and no, this life is not fair. That is how we learn as humans from the examples of others. If there was no unfairness, how would we know what fairness is? This was this child's Qadr (pre written in her book) we all have this appointment with death, there is no escaping it for any of us. Some sooner some later. Maybe her particular incident, as sad and as tragic as it is, will serve as an example and wake people up to make some changes to protect their children and not take for granted this very short life we have all been given. To Allah we belong and to Him we shall return...