I'm trying to remember the name of a movie/series episode where girls are sent to an institution for being rebellious, at this institution they will be corrected. Three girls sharing a bedroom become friends and decide to leave. They know they put sleeping drugs in the milk at night, so they don't drink it the last night.
While trying to escape, they discover that the institution is making copies of them by doing several surgeries on other girls that will replace them. The main character escapes and with her double they take revenge on the people that sent them there.
Coherence
to you.