What is the author's style in Mama's Bank Account by Kathryn Forbes?

The author Kathyrn Forbes uses simple, unadorned language in her recollections of the past, mixing present wisdom with the childlike ignorance and innocence of that time in her past to reveal truths about Mama. The narrator's tone is warm and nostalgic, and despite the family's poverty and difficulties, this was clearly a joyous time in the narrator's life.