So she went and came unto the man of God to mount Carmel. And it came to pass, when the man of God saw her afar off, that he said to Gehazi his servant, Behold, yonder is that Shunammite: (2 Kings 4:25)
The home of the prophet was probably on an eminence, whence it commanded a view of a large part of the valley below. Elisha saw the woman in the distance and recognized her.