hello, Peggy - To my knowledge Tippy is still alive. She would be about 70 now. I know she married actor/director William Conrad in the 1980's. He died in 1994. NBC, David Brinkley and New York University, where the Chet Huntley Memorial Lectures are held each, has not reply to my request for an address.
According to the March 8, 1959 New York Times, where I found my information, she was a graduate of the University of Maryland. She had a brother, Arthur Stringer, Jr.
The Bozeman Mt. Chronicle printed an interview and pictures back in 1977 on her.