Moonpenny Island (Balzer and Bray, 2015) by Tricia Springstubb is a story about change and offers encouragement that we can do more than simply survive.
Eleven-year-olds, Flor and Sylvie, are inseparable, so what is Flor going to do when Sylvie has to leave the island to go to school on the mainland? If that's not bad enough, Flor's mother leaves to take care of grandmother and Flor is afraid she might not come back. Her older sister has a secret too that has Flor worried.
I love what the author says on her website in her FAQ in answer to this question:
Did you always want to be a writer?
"The first thing I wanted to be was a dog. When I realized the odds of that, I switched to a cowgirl. Then an archeologist. I also wanted to be a mom. (Hooray! That came true.) I didn't decide to be a writer till I was grown-up."