Novels centered around daily life of pre-WW1 German aristocracy

It’s a specific topic, but I’m writing an alternate history story set roughly around this time period (late 19th-early 20th century) and I’d like to do more research/immerse myself more in preparation for writing one of my main protagonists (helps me get a better understanding of what could be her background, family dynamics, every-day life, etc.)

Historical fiction is fine, but obviously any biographies of real life aristocrats works just as well. So far, I know of Effi Briest and A Legacy (Sybil Bernard). Older Reddit threads seem to come up with books set in other European countries. Additionally, any non-fiction books is also appreciated.

Thank you!