I'm not sure which novel you're looking for because you didn't provide enough information. However, I can tell you some common plots of time-travel novels, hoping to help you find the novel you're looking for. The female protagonist might have transmigrated to a parallel world or some special event caused her to transmigrate to a little girl. Something strange happened to the little girl, such as suddenly becoming intelligent or possessing superpowers. The little girl had two brothers and her parents lived in harmony and happiness. You can also provide more details or descriptions so that I can more accurately help you find the novel you want.