"I'd like that," Katniss said, and she meant it. "I can teach you the dances I know, if you want."
No matter how awful things were, she'd been able to dance when the moment felt right. The last time she'd done it had been at Finnick and Annie's wedding, and that had been one of the best moments of the entire rebellion. Over too soon, ruined too soon by the mission and the mutts that had taken Finnick down, but... he was here. So that was only the stuff of nightmares.
She forced her mind away from it, because it was a dangerous path for her mind to go down, and focused on Penelope. Her roommate was happy, she could tell that much; this place couldn't be so bad if it was a place where people could be genuinely happy. But as for Katniss herself...
Her smile faded a little. It was a loaded question, although Penelope probably didn't know it. "I don't mind it here," she said. Explaining that in detail was too much to go into, much more than she wanted to share — for Penelope's sake as much as her own — so she said instead, "Sometimes I feel like I could be."
Specifically, when she was with Peeta. She let her thoughts turn to him, because it was better to dwell on what made her happy than what didn't, and she offered Penelope a small smile before clarifying, "There's someone who makes me feel like I could be."