"She's not quite right, but she's treated as a sort of pet."
Katniss Everdeen on Greasy Sae's granddaughter[src]

Greasy Sae's granddaughter is a young girl who tends to run about the Hob. It is implied she has a mental disorder, as mentioned in The Hunger Games when Katniss and Rue are talking about their districts, Rue brings up a boy, named Martin who tried to steal see-in-the-dark glasses but was killed by Peacekeepers in the process. Katniss then mentions how Greasy Sae's granddaughter runs around the Hob, and people tend to see her as a pet, chucking scraps of food and other items to her, somewhat how you would give a treat to a dog or other pet.

She is later mentioned in Mockingjay to have survived the District 12 bombings, and have left District 13 to return to District 12 with Greasy Sae. She later appears in Katniss' house when she returns, playing with a blue ball of yarn from Mrs. Everdeen knitting basket. Greasy Sae tells her to stop, but Katniss says that it is ok.