Norma wasn't at the diner, but I've found her. Bottom left, three along. Aunt Norma.
I lived in the Ludendorf area of North Yankton for a few months on my way through to Los Santos. Had run out of money so was sleeping in my Blade behind an old warehouse. It was when I first started turning tricks, to get the cash together for the final drive.
Aunt Norma was the heart and soul of both the diner, and the area in general. Not a judgemental bone in her body. The amount of free coffee, hot meals and sound advice that woman gave out to myself and a few of the other girls... There are no saints left.