What did Annemarie take from Ellen just before the Nazi officers entered their room?

Just before the Nazi officers entered their room, Annemarie took Ellen's Star of David necklace from around her neck. This action was to protect Ellen, as wearing the necklace could reveal her Jewish identity and put her in danger. Annemarie quickly hid the necklace in her hand, demonstrating her bravery and loyalty to her friend during a perilous moment.