What does Polly overhear at Stew Meat's store and what does she decide to do?

At Stew Meat's store, she overhears Agatha and Eunice discussing her condition and their plans to humiliate her, starting with inviting her to Agatha's house. Polly almost resolves not to go, but then decides to prove to them that no matter what they say or do, she can and will behave like a real lady.