Well, I am sorry, but I guess u don;t need to be upset at all, because like my Russian psyhologist said "all people when they are about 9 and 8 wants to be brave"' there are a lot of way to show the this kinda of ''bravness'' for example to steal something from the home:( obviously , its the law of the kid's mentality:) ( U can read Mark Twen ''The adventure of Tom Sawyer'' if u would like to see that all kids did the same at the age of 9 till 11. it doesn;t matter the piece of hame or a golden ring:) ( unortunately. try not to be angry at her:)
better ask her to write to u what she take (at the piece of paper) and to her own why she did it?