What is the author's style in Penny from Heaven by Jennifer L. Holm?

Penny from Heaven by Jennifer L. Holm is written entirely from the first person perspective of an eleven-year-old girl named Penny. She lives in a house with her mother and her mother's parents — Me-me and Pop-pop. The novel relies primarily on her narrative of the time and while there are conversations between the main character, Penny and those who play a role in her life, most are short and merely used to illustrate a point or explain a given situation. The period of time covered is less than one year, and it is a time in the main character's life where she is making the transition from child to adolescence.