Croak by Gina Damico is on sale for $1.99 for a short time also in ebook format. This isn't a fairy tale retelling, but it is folkloric, with the story of a teenaged Grim Reaper. Well-reviewed, too.
Fed up with her wild behavior, sixteen-year-old Lex’s parents ship her off to upstate New York to live with her Uncle Mort for the summer, hoping that a few months of dirty farm work will whip her back into shape. But Uncle Mort’s true occupation is much dirtier than shoveling manure. He’s a Grim Reaper. And he’s going to teach Lex the family business.
She quickly assimilates into the peculiar world of Croak, a town populated by reapers who deliver souls from this life to the next. But Lex can’t stop her desire for justice—or is it vengeance?—whenever she encounters a murder victim, craving to stop the attackers before they can strike again. Will she ditch Croak and go rogue with her reaper skills?