What happened to Elie one day at the factory? Afterwards, who cleans the blood from Elie and soothes him with kind words? What is unusual about this person? (chapter 4)

One day the Kapo, Idek, flies into a rage and starts beating Eliezer. A French girl who passes as Aryan comforts him in German, and many years later, Eliezer sees her again in Paris. She admits that she actually is Jewish and had false papers at the camp and that the only time she spoke German at the camp was to him.