6 on Easy Street by Betty Cavanna (1954)
Each of the children has a job to do in the old inn, and Deborah waits on table. Her main ambition is to get enough money to visit Craig in July for a week at the shore in Jersey. Very few of the guests leave tips, however, and she is forced to work out a different scheme for saving the money she needs.
How Deborah faces her problems during this summer is woven into a story of how a girl grows up. While it is difficult for her to overcome her selfishness and face the need for becoming mature, Deborah finds by the time the summer is over that her stay in Nantucket has turned out to be one of the happiest times of her life.
There is good characterization in this story, and a delightful picture of a family who know how to live together in heartwarming comradeship. There are glimpses into the thoughts and feelings of this family and their friends which are genuinely true to life, and bring the reader into acquaintance with real people. And there is the authentic background of Nantucket to add extra interest, zest and color to the story. (from the inside flap)