Who is Anya from Waiting for Anya and what is their importance?

Anya is Benjamin's daughter. Jo met Anya once when he was young when she came to visit her grandmother. Jo remembers Anya as a young, beautiful young girl who brought his father flowers. Anya becomes lost one day while on the road with her father. A plane flew overhead and shot down at them, forcing them to find cover. Anya and her father became separated. For this reason, Benjamin goes to Madame Horcada and waits for his daughter. Anya finally arrives at the farm after the war is over, but by then her father has died in a concentration camp.