This Would Make a Good Story Someday by Dana Alison Levy

Levy wrote this book using a peripheral character from the Family Fletcher Series. Sarah Johnston-Fischer is not thrilled to be spending the summer on a cross-country train ride with her two moms, her little sister, her older sister and her boyfriend, and a bunch of loud strangers. She wants to complete the pre-middle-school Reinvention Project she has set up with her best friends. But change doesn’t come easy, and everything she fights and tries to escape turns out to be the things she actually needs to reinvent herself before heading off to middle school.