Kim Reaper

Fifteen-year-old Kim Morse-lover of unicorns, rainbows, cupcakes with sprinkles, and loathe of anything dark and scary-lost her parents in a tragic accident five years ago.
Since then, Kim's been totally stuck in place, unable to confront her grief, much less move past it. When she stumbles across a grim reaper hovering over her sleeping grandma's bed, Kim leaps into action without thinking, afraid of losing what little family she has left.
She gets rid of the reaper! But now someone's got to take its place. Apparently, that someone is her. Kim has to play Grim Reaper for a week ...
... or until the world ends.
Whichever comes first.