In direction of one of the most famous stories of Hans Christian Andersen "The Little Match Girl", I want to write a tragedy for children; a story dealing with children who are suffering and who may not even have hope for the future. I want to acknowledge such children, who are rarely mentioned in mainstream children's fiction. But I don't know what kind of endings I can write which will be interesting and less horrific. Some of my professional writer friends who read one of my drafts said that the atmosphere of my work is too dark for a child. One of them said: "It is dangerous for a child to read this because its ending is too interesting and dark for a child, and there is a fear that he/she lose his/her way of life in this darkness!"
How can I tell, by myself, the difference between a tragedy for children and a tragedy for adults? What differences are appropriate, in endings or other parts of the story? What kind of usual tragic endings are adequate for children?
I would like very much to see examples from famous tragic books for children (as appropriate endings) and quotes from drama theoreticians or other professionals (for inappropriate endings).