Grace Makes it Great (American Girl) by Mary Casanova

When Grace learns that her grandparents' bakery might be closing after 30 years, she's crushed. She can't imagine her life (or her hometown) without the bakery. And how can her own business survive if the one that inspired her cannot? Grace wonders if she and her friends can find a way to help the bakery using their talents and newfound business skills. Can three girls really make a difference? Grace is determined to try.