Lol Marple! If I hadn't happened to catch the testimony on this particular day, I would have been wondering the same. Cindy's hair length over the last 3+ years was an issue when Cindy was questioned by the defense. If I understood their purpose correctly, it was to show that somebody other than Caylee on the mother's side MIGHT have had hair the length of that found in the trunk (challenging the assumption that mitochondrial DNA tied the hair to Caylee).
It was kinda silly, imo. The defense asked Cindy about her hair length in that time frame, Lee's hair length, and Casey's. They even asked her about granny's hair length and whether or not she ever rode in the Sunfire. Obviously, Cindy's hair was colored so it would be ruled out even if it was long enough. Lee's hair was too short. And Casey's was probably shorter than Caylee's and colored, Casey was really the only other possibility and she is alive (at least on the outside), so pretty much ensures the hair verified as coming from a decomposing body belongs to Caylee...