Danger from outside

Exploration Stage: Ballet Academy
From: Conductor
Description: How did Juliette manage to escape from the "ballet academy"? If Juliette sleepwalked like Charlotte, I am sure she locked herself in her room at night. Maybe she had an extra lock or used a "door stopper". Look for something like that.
Completed: Juliette must have been sleepwalking too. Every night she would put this stopper across the door to keep herself from slipping out of her room.