The Villain’s Daughter in law is Inherently Powerful

After six short, measly lives as insignificant items of a novel, Florine finally wakes up in the body of a shapeshifter. The problem? She's a tiny sable without enough power to turn into a human. While spending her days as a servant, she crosses paths with Kiraxus, the original novel's villain. She thinks her short life as a shapeshifter is over, but instead, he makes her the daughter-in-law of his family! Will Florine finally live the long life she desires? Or is it all too good to be true?