She didn't have the energy to fight with either of them, so when Eames drops the idea of a charm, Nancy is incredibly thankful.

"what I want?" She blinks at them. "I... I want to be with him, for the rest of my life. I don't want him to hit me- I want to marry him, to have his children. I want a family, a real one." Bill wouldn't marry her, and he didn't want children. That was the good thing about him being arrested when he was- he wasn't around to find out that Nancy had been pregnant at the time.