"Frances Kane's Fortune" by L. T. Meade

L. T. Meade was the pseudonym of Elizabeth Thomasina Meade Smith, a prolific writer of girls' stories. Her stories struck the hearts of girls around Ireland, and later around the world. In this book, the titular character comes into adulthood, leaving her girlhood behind. Love and all the emotions that come with it set her on an path that she's never undergone before.