I Transmigrated into a Book and Became a Spendthrift. How Did My Father Become Emperor?

[Everyone's Darling] [Adorable Baby] Shen Niannian opened her eyes and found herself transmigrated into the body of a five-year-old girl. Her mother had gone missing, her fate unknown. Her father, Shen Yuan, had dragged himself back from the battlefield with barely a life left in him. His leg was broken and his heart shattered, and every day he went on about joining his late wife. As General Shen's only heir, Shen Nian said, “Father, don't worry. You can go in peace. Your daughter will look after your inheritance.” Then she began squandering the family fortune in all sorts of ways: selling her father's sword, pawning his armor, and using his salary to treat the whole city to a feast. “Come on, Dad, let me anger you to death. That way, I'll get the inheritance sooner.” But Shen Yuan didn't die of anger. Instead, he... stood up?! “No way. I have to stay alive, or this little spendthrift will blow through the entire family fortune!” Shen Niannian: “?? Where's my inheritance?” If the inheritance wasn't enough to spend, then she'd have her father seize an even bigger fortune. “Dad, the throne looks pretty nice. Want to give it a try?” Shen Yuan: “...” Her three sworn brothers all turned to look at their little sister. She's crazy, but we're with her.