The search for McCain, which had been joined vigorously by law enforcement officials throughout the day and into the night on Monday, began after a worker from the Edgefield County Senior Citizens Council found her missing and the front door to the home open around 10 a.m.
That official search had been called off around 3 p.m. Tuesday, while a volunteer search party of about 20 individuals pressed on into the evening. One of these volunteers located McCain in a densely wooded area in the general area of her own home, but farther behind a nearby relative's house.
McCain was said to have been dehydrated, but not in serious condition, before being transported to University Hospital.
She had last been seen on Saturday.