Appearance at her death

My Grandfather went to the spring to get the drinking water.He lived on a farm and the spring was in a glen through the woods about a mile from the house.As he bent to dip the bucket, he saw a bright light and his mother who lived about 800 miles away was standing there in a long white dress.She smiled and disappeared.He told my grandmother when he got home and later that day they received a telegram that his mother had died just at the time she appeared to him.It meant a great deal to him throughout his life although he rarely talked about it.