She's Prim's size in diameter.

“I'm sick of people lying to me for my own good.”

“Katniss, I don't think President Snow will kill Peeta. If he does, he won't hav…”

“Oh, he's on top of it. It was volunteer only, but he pretended not to notice me…”

“I've asked you fifty questions and still have no sense of your life, your famil…”