She asked the Jewish lady (for the lack of a better word) to sign the witness affidavit. She refused, stating that my aunt's greed had no limits.
That's despicable - I honestly don't know what else to say. There's probably scores of honest and upright persons such as your aunt who have similar anecdotes, but as she did, they choose to press on with their lives and not raise a fuss - but szlachta are cut from a different cloth.
The worst thing is that she probably made that up
Could be. Or she read the same book I did. An Aussie author wrote a book about the Jews under Polish rule. There were several eyewitness accounts relating similar stories - people watching the ghetto burn. The context in which they relayed this detail was such that you felt as though the witnesses should have jumped the fence and started fighting as well.
There was a documentary a few years ago made by an Aussie comedian who calls himself "Austen Tatious". He's apparently of Polish/Jewish descent (I think his name was Glichman). He went to Poland to 'trace his roots'. He was quite angry towards the Polish, blaming them for the demise of his family and for taking his family's possessions during the war.
He went to the apartments where his family once lived, and on camera, stood in the atrium and started screaming out for his grandparents. Some old people came out to see what was going on, and told him his grandparents had left long ago. He was a strange man.