Anyone who's seen The Virgin Spring or Last House From The Left, should know that this has a similar style ending.

Eden Lake
(2008)

Jenny makes it back into the village finding refuge at an outdoor garden party, only to be confronted by the vengeful parents of two of the gang she killed (currently attending the above get together). Who proceed to then drag her (kicking & screaming) into a bathroom to be dealt with, while gang leader Brett (who instigated most of problems) listens to her final muffled cries from upstairs in his room (staring at his reflection).(Anyone who's seen The Virgin Spring or Last House From The Left, should

Thanks N.D. Woods!