It's Justin Time, Amber Brown

In Justin Time, for example, which opens on the eve of Amber's birthday, she agitates for a watch ("I, Amber Brown, am one very excited six-year, 364-day-old kid"); she also tries to come to terms with her best friend's perpetual tardiness (the friend is Justin Daniels, who moves away in Crayon). In Trip, the Browns and the Daniels vacation together in the Poconos, during the course of which Justin hurts Amber's feelings, a business phone call during a dad-supervised outdoor sleepover annoys Amber, and Justin's left-out little brother finds a way to be included.