When we bought that slot glass I researched "Judy". Since then, I forgot the answer. I searched the archives and found it...

Dick Graves had a daughter, Judy, born on May 10, 1945. Judy had a recipe for a chocolate cake roll that was on the menu for many years as "Judy's Chocolate Roll". I have to believe that "Judy's Special" slot machine was named for Dick's daughter.

There's a bit more information in the archives, from when I first posted this. Unfortunately, the link to Dick Graves oral history doesn't work

http://www.thechipboard.com/archives/archives.pl/bid/323/md/read/id/1263614/sbj/who-s-judy-g/