Shelly Olson’s mother, who has dementia, has lived at the Scandia Village nursing home in rural Sister Bay, Wisconsin, for almost five years. At first, Olson said, her mother received great care at the facility, then owned by a not-for-profit organization, the Evangelical Lutheran Good Samaritan Society. Then in 2019, Sanford Health — a not-for-profit, tax-exempt hospital system — acquired the nursing home. The covid-19 pandemic struck soon after. From then on, the facility was regularly short of staff, and residents endured long wait times and other care problems, said Olson, a registered nur…