Betty Anne Gagnon, who was 48, was kept in a chicken coop, a dog run and a converted school bus with no heat, running water or electricity.
She died of a head injury in 2009 but a medical examiner said that could have been caused by a fall.
Her sister and brother-in-law, Denise and Michael Scriven, pleaded guilty last month to failing to provide the necessities of life.
Court of Queen's Bench Justice Sterling Sanderman says he isn't prepared to sentence the couple until their psychiatric evaluations are complete.
The sentencing hearing has been rescheduled for June 27.