I am looking for a book I read in the mid-1960’s, probably young adult. Tells the story of a girl who moves to Cape Cod? (some seashore region) to train with a famous tole (painting on tin ware, etc.) painter. At first she just copies his designs, but he insists she should find her own muse. One day she sees a group of kids playing ring-around-a-rosie and does a design based on that.