Why does Pizan choose to make the Amazons side with the Trojans rather than the Greeks?

Penthesilea was a virgin her entire life before falling in love with the Trojan prince, Hector. When he was killed by Achilles in battle, she promised to avenge his death. This may have been the first reason why the Amazons sided with the Trojans. I also believe that she made the Amazons side with the Trojans because the Trojans were much more civilized and less barbaric than the Greeks. The Greeks represented a lot of the wrong that came from men which is what the Amazons resented and wanted to stay away from.