Success in the game requires efficient management of money and energy. According to guides on the Steam Community:
Complete her route and also donate 50 books to the library (buy cheap novels from the city vendor every Sunday). The library stays open, she publishes her novel, and the final scene shows you two reading together on the farm porch.
This walkthrough is not just a list of coordinates; it is a lantern for the long days. It is for the wanderer standing at the crossroads of the Old Mill, unsure if the path leads to the Sunflower Maze or the Cider Orchard. It is for the dreamer trying to decipher the cryptic riddles left by the stone well in the town square.