My ten year old daughter has been enjoying the Dear America series from Scholastic. I believe that they've had a positive effect on her character (particular in the "complaint" department) as the stories focus on girls about her age living in difficult times. As they're written by a number of different authors, please don't take this review as an endorsement of all of the titles.
A series of six historical fiction titles from the time of the Great Depression; page count above is per book.
Blue Willow is the sweet story of ten-year-old Janey Larkin, whose family is struggling to make ends meet in California's Central Valley during the Great Depression. Janey and her family have a few treasured possessions which they've dragged along with them from place to place because of the difficulties in finding work. Janey's beautiful blue willow plate is her greatest treasure, but when tough times get worse, she decides to offer it as payment for her family's rent...