Isaac had already explained the story to her.

He had requested her company.

Willie found out some secret details, so he knew the banquet was more than just a chance for rich people to meet and chat. People were talking about how this family wanted to find someone for their child to marry. They were having trouble with their family business and thought marrying into another family could help them solve their problems.

People who were aware of the secret details wouldn't like to be selected.

Sure, they could decline if selected.