For a three-act plot analysis, put on your screenwriter’s hat. Moviemakers know the formula well: at the end of Act One, the main character is drawn in completely to a conflict. During Act Two, she is farthest away from her goals. At the end of Act Three, the story is resolved.
Act I
Sophie journeys from Haiti to the U.S. to be with Martine.
Act II
Sophie takes up with Joseph and is caught out by Martine. She elopes with Joseph after Martine begins the virginity tests—and the mother and daughter don't speak again for a few years.
Act III
Sophie and Martine meet again in Haiti and begin the process of reconciliation, which is cut short by Martine's suicide.