I am a preacher and most of my colleagues are not trained to handle this type of situation with young children. Always be willing to listen to students and teachers as they grieve. One final thought - one of my students died in a horrific accident in front of the school. The following day, when the children went out for recess they began to play and have a good time. It is only natural for children to play, even in times of grief.
Life does go on and things do get better.
Never forget that.