I believe patrols to search for the creature are the best plan of action. I need to get to higher ground so I can try to sense its presence. We definitely need to make sure not a single child leaves the villa. My charge has been informed that what she is hearing is an illusion, but I don't think that fact will stop It from continuing to reach out to her or any of the others.
If you encounter It, be on your guard. It apparently has the ability to make you see your fears.