How does Juana react when Kino suggest surrendering? What does this reveal about Juana?

In chapter six, Kino feels a sudden sense of hopelessness and considers surrendering to the trackers. Juana knows this will mean certain death for them and chastises Kino for giving up on his family. This shows Juana to be a strong person, even stronger than Kino, under the most stressful circumstances.