The Reincarnation Of The Duke’s Daughter summary:

Read manhwa The Reincarnation of the Duke's Daughter**Hildegard of Akaraxia.** A genius sword mage, the first mage tower master, and the lady of the continent's greatest duke's house. She lacked for nothing, but for her family and her own ambition, she never rested. In the end, she gave her life to seal the Demon G** and fell into slumber. **"Wait, am I not dead?"** Eighty years later, she wakes up in the body of a descendant. But The golden fountain, the mage tower, the mines All gone. A gloomy, run-down mansion. Stale bread and watered-down soup. Young descendants struggling to pay overdue debts. A bankrupt duchy? **"Just wait. I'll restore the glory of the family I once built!".