She's given up any hope that she'll ever be free of this place, ever see her husband or children again. The only thing that keeps her going is the thought that she might be able to make captivity slightly more bearable for her fellow prisoners. By maintaining her cheer, by trying to keep their spirits up, maybe she can do something worth living for. Maybe she can save some of them from the misery she feels.
She sits down at her microphone and thumbs the "on" switch. And she's on the air.
"Good morning, everyone! It's a beautiful day!"