I Got Rich and Retired

The heroine made some foolish decisions when she was young and racked up debt through online loans and credit cards. She has been working hard to pay it off, but her earnings barely make a dent, and her parents are getting old. After another argument with her mother, she wins the lottery jackpot. She pays off her debts and gives her parents money for living expenses so they can enjoy the life they want. Then she buys a house in the mountains and lives a quiet country life on her own with her cat.