it is cultivation setting, where the female lead transmigrates into the eldest princess whose mother is "dead" , and coz her father the king loved the mother very much he dotes on her,but her reputation isn't great in public because of her younger sister, daughter of a concubine. The ml is the national state teacher or someone who has a snake as a spiritual pet (the fl is always making jokes on eating it as snake soup ). The ml used to hate previous fl but when fl tranmigrates he tells her he has been waiting for her and tell her to cultivate. In the first chapter fl buys a wolf just coz her younger sister wanted it. She also has a lot of spiritual beats in her residence who do work and she feeds them spiritual fruits in exchange. does anyone know the name of this book?
Possibly The divine physician's overbearing wife? I've only read the synopsis, but it seems pretty similar to what you're looking for.