Wanda, the official
So let's get this straight. Aunt Wanda not only survived the Holocaust in Poland, but some time soon afterward she entered the communist elite. How is it plausible that the Polish authorities would have granted Aunt Wanda, a single Jewish woman, a position of high power.
Unfortunatly in reality, there were pogroms in Poland even after the war; see "Anti-Jewish violence in Poland, 1944–46" on Wikipedia. At that time, the floodgates opened wide for the remaining survivors' immigration to Israel.