Inner Demons (2014) on Netflix

Plot summary

Carson Morris was a straight-A student who started using drugs shortly after she enrolled at a prestigious Catholic high school, and she has used them for the past year. She agrees, reluctantly, to let a film crew monitor her for a documentary show while she checks into a rehab clinic. The other patients mock her, since the reason she gives for her drug use is demonic possession rather than addiction. Jason, a production assistant, is sympathetic and bonds with her. The crew's cameras capture displays of supernatural behavior, but only when Carson is alone. Suggestions arise of bringing in an exorcist, though the clinic's physician, Dean Pretiss, argues that this would be harmful to her mental well-being.