Who is Kata from The Glass Room and what is their importance?

Kata is a Jewish dressmaker and occasional prostitute. She meets Viktor in Vienna and begins an affair with him. Slowly she realizes that she does not want to only sleep with Viktor, she wants him to run away with her. He refuses. Kata flees Vienna when the Germans invade. She and Viktor are reunited when she gets to Mesto. She quickly becomes the Landauer children's nanny and Viktor's mistress again. Once the family flees to Switzerland and then Paris, Kata and her daughter Marika are separated from the Landauers. It is unclear as to whether or not Kata dies in a concentration camp.