I'd be more likely to be the kind of 'demonic harasser' that plays practical jokes. Wait until people turn the light off to go to bed and flick it back on, move their keys to a different place to where they left them, hide the TV remote down the back of the sofa, all that jazz.
Also. She came home and since nothing has been happening she's affirmed that her praying and anointing the house in 'holy oil' was what stopped the demonic harassment, not the cool weather. Fuck it I'm not even going to bother explaining how science works, she barely even passed grade school with that mentality.