The Jewelry Makers by Diana Dennelly

When their father is injured on the job, twins Laura and Elizabeth find a way to help their parents financially during the summer months. They make beautiful sea glass jewelry and display it at a jewelry store owned by Agnes, unknown to the girls, a distant cousin to the queen. When Laura and Elizabeth find out the crown princess is visiting the store, they anxiously await to see if she buys a piece of their jewelry. (I know children are under a lot of stress these days. It was not my intention to add to their stress by having them worry about their parents' finances, that's why I have the girls helping their parents only during the summer months. My wish is to give children hope that through work and creativity they can find solutions when situations arise.)