What Katy Did by Susan M Coolidge.
 
Twelve-year-old Katy Carr is a whirlwind of energy and mischief. Living in a bustling lakeside town with her four siblings, Katy dreams of being graceful and kind, but her reality is more tangled hair and scraped knees. When a beloved cousin arrives, Katy is struck by her elegance and vows to change. But fate has other plans. An accident confines Katy to her room, forcing her to confront her limitations and discover the true meaning of inner strength and resilience. "What Katy Did" is a heartwarming tale of growth, family, and learning to embrace who you are.