What does Huck tell Mary Jane about the Duke and King? How does she respond

Huck doesn't want Mary Jane to worry. Huck sees Mary Jane sitting on her floor, crying while packing to go to England with her uncles. Mary Jane explains that she is upset about the slaves being so mistreated, and Huck blurts out that they will be together again in two weeks at the most, knowing the Duke and King will abandon the town. When he realizes he has slipped, he decides to tell her everything. She becomes furious as he relates the story, and when Huck finishes, she calls the King a "brute."