Accomplishments of the Duke's Daughter is a fantasy Japanese light novel series, although it's a fantasy world with no magic. It's published by Seven Seas Entertainment's Airship imprint. I bought my copy brand new.
Review:
Iris remembers her past life as a Japanese office lady at the worst possible moment, when it's too late to change anything. She knows that she has somehow been reborn as the villainess of the game You Are My Princess, and she's currently experiencing the climax of the route in which the heroine, Yuri, ends up with Prince Edward, Iris's former fiance. If things proceed as they do in the game, she'll be banished to a nunnery.
To her shock, however, that's not what happens. Instead, her father makes her the governor of Armelia, the family's domain, a task that would normally be given to the family's eldest son. Iris isn't sure why the story has changed, but she's more than willing to accept this fresh start being offered to her. And so begins Iris's efforts to improve Armelia's government and economy and make it a better place to live.