For MMGM, I am recommending Heartbeat by Sharon Creech.
Here's the publisher's description:
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 changes over time, just like the apple Annie's been assigned to draw. But as she watches and listens, Annie begins to understand the many rhythms of life, and how she fits within them.
I loved everything about this book! One of my favorite things about it was the writing. The main character, Annie, has a realistic voice which is both thoughtful and down-to-earth, and the writing is expressed in beautiful, rhythmic verse. Scenes are described vividly, as are the emotions contained within them (unsurprising, since Creech has written many amazing books, including Newbery Medal-winning Walk Two Moons). The book has a great plot as well, never dragging on as it jumps from one topic to another, dealing with aging, friendship, and new siblings, with added extras thrown in (such as running or drawing an apple). Heartbeat is not very long (only 180 pages of verse in large font), but each chapter is a touching moment. Everyone who is lucky enough to read this book will definitely enjoy it!