Polly Oliver's Problem

Novel for children and teens. According to Wikipedia: "Kate Douglas Wiggin ( 1856 -1923) was an American children's author and educator. Kate Douglas Smith Wiggin was born in Philadelphia, and was of Welsh descent. She started the first free kindergarten in San Francisco in 1878 (the Silver Street Free Kindergarten). With her sister in the 1880s she also established a training school for kindergarten teachers. She was also a writer of children's books, the best known being The Birds' Christmas Carol (1887) and Rebecca of Sunnybrook Farm (1903)."