She dies from overwork and transmigrates into the body of a twelve-year-old child bride. There are four people in the family, and the rice jar is almost empty.
No problem. She takes up the craft passed down by her mother, a fellow transmigrator, and builds up the family business one coin at a time, supporting her young scholar husband all the way to the top scholar rank.
She thinks life will just go on like this, until she reaches the capital and is invited to the prince's residence by a princess consort she's met only twice. What? You're saying the prince in your family is my biological father?