How does the narrator learn of Modou's new wife and what is she told?

It is only in the evening of the wedding that the narrator is informed by the Imam and Modou's brother that her husband has married again. Mawdo Bw is also present. As Tamsir, Modou's brother, tells the narrator that Modou thanks her for all the years she has given him and that as a first wife she is now Modou's mother and friend.