This Raging Light by Estelle Laure

Can the best thing happen at the worst time? Her dad went crazy. Her mom left town. She has bills to pay and a little sister to look after. Now is not the time for level-headed seventeen-year-old Lucille to fall in love. But love—messy, inconvenient love—is what she’s about to experience when she falls for Digby Jones, her best friend’s brother.