Ch.15 why annemarie need to pretend to behave like a silly little girl when the soldiers will stop her?

Just as Annemarie asks if she can leave, one soldier lifts the napkin and notices the precious packet hidden in the bottom of the basket. Annemarie panics, thinking the whole operation is compromised, but it turns out that the packet holds only a white handkerchief. The Germans make fun of Annemarie and let her go. When she arrives at the harbor, she finds Uncle Henrik on his boat, looking worried. When he sees that Annemarie has brought the packet, he is very relieved and tells her that she has saved the mission. He laughs when he finds out that the Germans fed his bread to the dogs, and Annemarie hurries home.