This event shows God’s grace (his undeserved kindness) and sovereignty (his complete rule and control). Pharaoh had ordered that Hebrew baby boys be killed. Yet Pharaoh’s daughter paid the mother of Moses to nurse him instead.
The story may suggest that the princess understood who the baby’s mother was. She did not ask questions that would have caused trouble. If this is correct, both women may have quietly understood the situation without speaking about it directly.
Moses was saved because God was working behind the events. He was not saved because someone was tricked or deceived.