Madame Forestier (from Guy du Maupassant's "The Necklace") is a secondary character. While her character is flat (lacks an in-depth description), Madame Forestier impacts the protagonist greatly. Madame Forestier is a friend of Mathilde Loisel (the protagonist). Mathilde wishes nothing more than to live the life of the rich. After her husband gains an invitation to a proper formal soiree, Madame Loisel borrows a necklace from Madame Forestier.
Over the course of the party, Madame Loisel loses Madame Forestier's necklace. She and her husband take out a loan in order to replace the necklace. It takes them ten years to pay off the debt. During the time, the Loisel's must live a truly poor life.
At the end of the story, Madame Loisel and Madame Forestier run into one another (after many years). Madame Forestier does not recognize Madame Loisel. Madame Forestier asks what has happened to Madame Loisel. Loisel tells Madame Forestier that she had lost her necklace and has spent the last ten years repaying the debt to replace the necklace. Madame Forestier tells Loisel that the necklace was paste (fake). Essentially, Madame Loisel has lost everything for nothing.
Therefore, Madame Forestier represents far more than a rich friend of Madame Loisel. She represents all which Madame Loisel wishes she had (in the beginning). She also comes to be what Loisel blames for her fall into true poverty.
mme.forestier is the friend of mathilde loisel.she is the rich friend..