When Does Resident's Absence Become Abandonment?

Q A resident who moved into an assisted unit a year and a half ago has not been living there. She pays rent, but she uses the unit only as a storage space and a mail drop. She hasn’t stayed in the unit since her lease began. She admitted that, for the past year, she has been sleeping at her daughter’s house in town. The resident claims that she takes care of her daughter, who has a serious illness, and her granddaughter, who is a minor child.