She supposes that this is what it's like to have a family. She watches them all and she's impressed. No one really likes Lacey, who never stops complaining or whining or just generally insulting someone. She never stops being ungrateful for the home that they've given her, never stops moaning that she's hungry on these meagre rations.
But they welcome her anyway. They could blindfold her and take her out into the desert, leave her to find her own way.
They don't.
Instead she becomes part of them, just like Jamie and Ian and Jared and Kyle and everyone else.