Out to Sea by Helen Kellock

Out to Sea follows the journey of a young girl named Lara who is so sad after the death of her grandmother that she is carried out to sea on a flood of her own tears. When it seems like sadness has overwhelmed her entirely, she discovers a pearl at the bottom of the ocean that triggers memories of the many happy times Lara shared with her grandmother. With the pearl safely at her side, Lara realises that she is not alone and finds the strength to pick up her oars and row herself back home.