Echo's sister
(Book)

"Twelve-year-old El has planned on making her first week at a new school fantastic. She won't go by her given name, Laughter. She'll sit in the back of the classroom where she can make new friends. She won't even have time to think about all the fun her old friends are having without her. Everything will be great. But when her dad picks her up after school and tells her that her younger sister, Echo, has a life-threatening illness, her world is suddenly turned upside down. And with her parents now pressed for time and money, El feels lost and powerless. Then she befriends Octavius, the only other kid in school who gets what she's going through. As El begins to adjust to her new life, she soon finds that maybe a little hope and a lot of love can overcome any obstacle"--Publisher's website.