Let's Scare Jessica to Death

After Jessica is released from the psychiatric institution where she had been recuperating for six months from a nervous breakdown, Duncan, her musician husband, takes her to live at a farmhouse in upstate New York to restart their lives as apple farmers, he having sunk all their money into the proposition. Their friend Woody is staying with them indefinitely to help them get settled. They don't seem to be welcomed by the locals, arguably in part because they are driving a hearse, in part because they are deemed hippies in indeed being what they themselves would consider free spirits, and in part because they are living at the old Bishop place with its legends concerning the mysterious end of some of the Bishop family members. Arriving at the farmhouse, they discover a young woman squatting there, Emily who they eventually ask to stay in she seeming to be a free spirit like them. Throughout this situation, Jessica, in not wanting to appear crazy and thus sent back to the hospital, doesn't want to tell especially Duncan that she has been seeing visions of people and is hearing voices telling her to do things which to her are real but which others would probably tell her are figments of her imagination, Jessica who additionally fears she going crazy an excuse for Duncan to leave her especially as he seems to be attracted to Emily. The question then becomes what truly is happening to Jessica.