Rosa is Hans' wife and Liesel's foster mother. She is very calm, kind and good-hearted woman. She makes money by doing laundry for rich neighbors. Unlike her husband, Rosa first comes across as cold and impatient. The story reveals through her treatment of Liesel and willingness to take in Max, however, that beneath her tough exterior she is in fact kind and caring. Death describes Rosa as a good woman for a crisis: when she knows that there are now bad times she gathers herself and sheers up everyone who was near her, who she loves very much.
Rosa Hubermann in the Essays