Müller is noted for her works depicting the effects of violence, cruelty and terror, usually in the setting of the Socialist Republic of Romania under the repressive Nicolae Ceaușescu regime which she has experienced herself. Many of her works are told from the viewpoint of the German minority in Romania and are also a depiction of the modern history of the Germans in the Banat and Transylvania. Her much acclaimed 2009 novel "The Hunger Angel" ("Atemschaukel") portrays the deportation of Romania's German minority to Soviet Gulags during the Soviet occupation of Romania for use as German forced labor.