Ok the name of the book is heartbeat by Sharon Creech this book is juvenile fiction
A short summary is Quote: Run run run. That's what twelve-year-old Annie loves to do. When she's barefoot and running, she can hear her heart beating . . . thump-THUMP, thump-THUMP. It's a rhythm that makes sense in a year when everything's shifting: Her mother is pregnant, her grandfather is forgetful, and her best friend, Max, is always moody. Everything is changing, just like the apple Annie's been assigned to draw a hundred times. Newbery Medal winner Sharon Creech masterfully weaves this story about a young girl beginning to understand the many rhythms of life and how she fits within them.

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