I just found out.
She was one funny and interesting lady.
"Marie Rudisill, (March 13, 1911 - November 3, 2006), was a writer and television personality, best known as the nonagenarian woman who appeared in the "Ask the Fruitcake Lady" segments on The Tonight Show on American television. She was an aunt to novelist Truman Capote (his mother, Lillie Mae Faulk, was her elder sister). Rudisill helped to raise Capote, who lived with her at times during his childhood, both in Alabama and New York City.
Rudisill was born Edna Marie Faulk in Monroeville, Alabama. She married James Rudisill in 1939. The couple had one son, James, and Rudisill had three grandchildren.
Rudisill authored eight books, including a book titled Fruitcake: Memories of Truman Capote & Sook. She was a resident of Florida.
Rudisill's book Fruitcake led to her being invited to be a guest on The Tonight Show in December 2000. During her first visit she showed Jay Leno and Mel Gibson how to make fruitcakes. This led to her being named the Fruitcake Lady and to several more appearances on The Tonight Show in which she instructed host Jay Leno and other guests in the preparation of various baked desserts."
Jay Leno's tribute to her:
http://www.youtube.com/watch?v=WnudM458uz8