I just wanted to thank you for all the sugestions. I have not had the oportunity of aplying them since DD has not brought up the subject yet. Knowing her, she will sooner or later.
Yesterday she was worried by a fire in a building. She thought that people may have died or loose their house. Fortunately there were no causalties and it was not an appartment building and this put her mind at rest.
Now she fears a fire in our house ....
As for doing something tangible I am going to suggest to her giving her old (ie. small but quite new) clothing and some old toys to some charity.