Some more suggestions (probably not on school curricula (I wouldn't know about that), but good reads and decent German, plus, you could go off on a tangent and explore the historical backgrounds, events, persons in the books):
Matthias Brandt, Raumpatrouille
The author is one of the sons of former German chancellor Willy Brandt and the book is about some of his childhood memories, so you could explore some of the German political figures of the late 1960s and early 1970s
Tom Saller, Wenn Martha tanzt
This is the tale of a woman (fictitious) who went to study at the Bauhaus in Weimar and went missing when the Wilhelm Gustloff sank, so you can add a bit of art history and also learn about the rise of antisemitism and World War II.
Jenny Erpenbeck, Heimsuchung
This is about a house on a lake somewhere in Brandenburg and its various owners/inhabitants over the years, spanning the whole 20th century, so you get Weimar Republic, Third Reich, WWII, GDR and German re-unification.
Also, yes, Wolf Haas is great, especially when read by Wolf Haas. He is, however, Austrian, so he uses some expressions you and your daughter will likely not be familiar with, but don't let that put you off.