Beauty Queens By Libba Bray

Teen beauty queens. A lost island. Mysteries and dangers. No access to email. And the spirit of fierce, feral competition that lives deep in the heart of every girl, a savage brutality that can only be revealed by a journey into the heart of non-exfoliated darkness. Oh, the horror, the horror! 
When a plane crash strands thirteen teen beauty contestants on a mysterious island, they struggle to survive, to get along with one another, to combat the island's other diabolical occupants, and to learn their dance numbers in case they are rescued in time for the competition.