Why did she have to die?

"Thirteen-year-old Elly Rowan is living in the shadow of her 14-year-old "perfect" sister, Kathy, the golden child in the family. Suddenly, Kathy is gone and Elly is left to find her way alone, rather than follow in Kathy's footsteps."@en
"For thirteen years, Elly has been in Kathy's shadow, always second best. Even so, the two of them understand each other as only sisters can. Jealousy, anger, and resentment give way to guilt when Kathy dies suddenly and Elly is left to ask, "Why did she have to die'""@en
"""It isn't true," Elly shouted. "She's my sister. The pretty one. The smart one." Elly tried to block out the horrible words her mother had spoken. Kathy couldn't be dead. For thirteen years, Elly had been in Kathy's shadow, always second best. Even so, the two of them had understood each other as only sisters can. And now, her sister was gone forever."--Page 4 of cover."@en
"For thirteen years, Elly has been in Kathy's shadow, always second best. Even so, the two of them understand each other as only sisters can. Jealousy, anger, and resentment give way to guilt when Kathy dies suddenly and Elly is left to ask, "Why did she have to die?""