Again, I need to know why she suddenly needs to survive (or why she didn’t need to survive before). I have no sense of what’s at stake. It’s a great concept and ordinarily surviving would be a goal in and of itself, but when you say she expected to die, I need something stronger and more specific to explain why she suddenly needs to live. Maybe she’s living to carry on her father’s name? Throw in a “to” clause (“When her rock star father is murdered, Skylar Benson, a sixteen year old girl with cystic fibrosis must do the one thing she never expected to [honor his memory/find his killers/find fulfillment/prevent the zombie apocalypse]–survive.”) It’s a great one-sentence summary, but I really need that motivator before I’m hooked enough to want to pick the book up.