Mrs. Merriweather is talking about Maycomb's black community and the after-effects of Tom Robinson's trial. She is stating that once the black community realizes that the white population has forgiven them, then the disruption caused by the trial will cease to exist, and everything will return to normal. Her statement is obviously ironic. In her ignorance, which is shared by many of the whites in Maycomb, she believes that the black community is in need of forgiveness from the white community for the trial and its aftermath. Just the opposite is true. The trial and conviction of Tom Robinson was a travesty of justice, brought about by the racism of the town's white population. Clearly, if one group of people is in need of forgiveness for committing a moral wrong against the other, it is Maycomb's white community that must seek forgiveness from the black community.