Hazel Bly and the Deep Blue Sea by Ashley Herring Blake 

Hazel Bly used to live in the perfect house with the perfect family in sunny California. But when a kayaking trip goes horribly wrong, Mum is suddenly gone forever and Hazel is left with crippling anxiety and a jagged scar on her face. After Mum’s death, Hazel, her other mother, Mama, and her little sister, Peach, needed a fresh start. So for the last two years, the Bly girls have lived all over the country, never settling anywhere for more than a few months… Read more.