Suterare Koushaku Fujin wa, Heion na Seikatsu wo Onozomi no You desu

"I’ll find happiness on my own terms!" A cunning duchess’s land reform human fantasy! In the kingdom of Francesca, where harsh feudal rule reigns, noble-born Melphina’s life has been one misfortune after another. Unloved by her family—and now, even her husband declares he has no intention of loving her. But Melphina doesn’t panic. "In that case, I’ll live my life however I please!" Wishing for freedom, she negotiates for a remote northern territory and begins rebuilding it using the random knowledge she gained from her past life. Driven by her compassion for the people, her efforts soon begin to change the very fabric of the era. The young lady who would one day be known as the Northern Noblewoman becomes a beacon of hope for all her subjects! A tale of bold land reform and quiet resilience — the rise of a determined duchess begins!

https://www.cmoa.jp/title/326557/