England passed the Navigation Acts because it was acting within the economic theory of mercantilism where they wanted to keep all the wealth in the Empire and to be more successful than other European powers who did not have colonies. The Navigation Acts were a series of laws that restricted foreign ships for trade between Britain and its colonies. It lasted for two hundred years.
In considering how to respond, you should recognize the feelings of Mrs. White in which she feels despair and guilt that was evident on her statement. It is best to recognize her feelings, have an empathy towards her feelings and to find a best way that will suitable reply that will not offend the other party.