I think there were mistakes made with Granny's hair.... When she would get up out of bed she would have it down in 2 braids and it was only to her shoulders and appeared to be quite thin... BUT in the episode Granny Lives it Up and she's entertaining 2 men, running back and forth between the 2 taking her hair up and down, it was all the way down to her waist, even a little past her waist and it looked VERY THICK... Obviously Irene Ryan wore a wig, so I guess they didn't put much emphasis on.... BUT how long do you picture her hair being ASSUMING it was all real? I always wanted to picture Granny having really LONG hair, like to her waist or even past like it was in Granny Lives it Up, even though it was shown to be shorter much more often. I could picture Granny as NEVER having cut her hair, which is why it would be super long

Maybe not Crystal Gayle long, but I always imagined it was very long.

I would guess middle of her back long.

I wish Granny had had her hair completely down at least once... Same for Alice on the Brady Bunch

I think down past her waist sounds consistent with her character.