Final answer:
Madame Schacter's nightmare foreshadowed the imminent arrival at Auschwitz, symbolizing the horrors of the Holocaust.
Step-by-step explanation:
Madame Schacter's nightmare in which she repeatedly exclaimed seeing fire and flames foreshadowed the arrival at Auschwitz, a concentration and extermination camp where mass killings were carried out using gas chambers, and then bodies were often cremated. This terrifying premonition symbolized the horrific future that awaited the Jewish prisoners, a stark representation of the Holocaust's cruelty. The Allies eventually liberated the camps, but Madame Schacter’s visions were a forewarning of the atrocities that the prisoners would encounter before liberation.