WARWICK, R.I. — Mary Balcerzak’s nightmare was coming to an end. The coronavirus-positive woman spent 10 hours sitting with other infected patients in a small emergency department meeting room before health-care workers were able to find a bed for her in tiny Room 25. Now, 36 hours after she arrived, Balcerzak, 70, was about to move upstairs where she belonged, to a bed on a floor inside Kent Hospital.