Shuraba Hime

https://www.cmoa.jp/title/352412/ 33-year-old office worker Yoshiko Kume, who suffered a crushing defeat in a hellish marriage hunt and fell off a cliff, awakens to find herself reincarnated as Chloe (15 years old), the daughter of a marquise in the opulent Kingdom of Florence. In a dazzlingly corrupt aristocratic society, the only weapon her 30-something soul possesses is the knowledge of an administrative scrivener she cultivated in her previous life. In this unjust new world, she must forge her own destiny and strive to survive.