Although Guillemette appears in only four of the ten scenes of the Farce (according to the scene division in the modern French translation), she is much more than just a peripheral character. She has a big influence on the events of the play. The cloth that is stolen is largely for her, as Pathelin promises her: "Pour vous, deux aulnes et demye" . This is important because the entire play is based around the theft of this cloth. As well as this, Guillemette is probably the character most responsible for the drapier's eventual madness. This is thanks to her successful deception of the drapier when he comes to collect the payment he has been promised. She encourages the drapier to think that he is going mad; for example when she exclaims to him: "Ha! Guillaume, il ne fault point couvrir de chaume ycy. Me bailliez ses brocars? Alez sorner a vos coquars, a qui vous vouldr[i]ez jouer." So it can be seen that, despite only appearing in less than half of the play's scenes, Guillemette is essential to the story of the play.
Furthermore, in relation to the plays other protagonists, Guillemette is very intelligent. Despite the fact that her husband Pathelin, the play's central character, is a lawyer, he seems inferior to her in intellect and maturity. This comes across most clearly in scenes I and III. The fact that Pathelin and Guillemette are the only two characters in these scenes means it