Such Small Hands 

Drama |  Film4  | Wellington Films

Dir Maria Martinez Bayona 

At an orphanage for girls, the group's unchecked pack mentality alienates a new arrival. To swing the balance of power, she invents a manipulative night game.

IMDB

(Excerpts 'Tickle', 'Ginger Doll', 'The Game is Easy', courtesy of Wellington Films)