The info on Rachel McGill was good. Just what I needed.
Mary McNiece Culpeper was wrong one. I know that Eloise McNiece daughter of William Walter McNiece was born in 1927/28 New Orleans and that her daughter Mary was born in 1949 in Georgia. so the one in Mississippi can't be right although the Names do match. That's what makes it hard to find them.
Guess I won't be able to find what I need until 1959 census is released unless I luck out and find someone who actually knew Mary. That's what I'm hoping for. Her classmates should be still around.