One of her books, My Sister's Keeper.
Quote:
Anna is not sick, but she might as well be. By age thirteen, she has undergone countless surgeries, transfusions, and shots so that her older sister Kate can somehow fight leukemia that has plagued her since childhood. The product of preimplantation genetic diagnosis (PGD), Anna was conceived as a bone marrow match for Kate-a life role that she has never challenged . . . until now. Like most teenagers, Anna is beginning to question who she truly is. But unlike most teenagers, she has always been defined in terms of her sister-and so Anna makes a decision that for most would be unthinkable, a decision that will tear her family apart and have perhaps fatal consequences for her sister she loves.
The only reason she's alive is to save her sister. Anyone read it? Actually, I haven't but have been told to read it by many people. It's supposed to be really good...
There's also a movie for it, which is in the Post-Production Stages, and is coming out in 2009.