She needed to rest somehow , but most important was making sure the Hunter would be ready to go , and he gave her a job to do . She wandered over to the door into the lab and locked it . After that , she wandered back to the closet X had nodded at , and started rifling threw things .

Question: What may have been the reason she locked the door ?
Answer: So she could go to sleep without being caught by Hunter .So she could be alone with Hunter and not be disturbed .So she and X could rifle through the closet .So no one would see her going through the storage spaces .