Here is a selection of accessible secondary material that you might find useful:

 

Books:

Paula Clifford, ‘La Chastelaine de Vergi’; and, Jean Renart, ‘Le Lai de l’ombre’ (London: Grant & Cutler, 1986)

 

Articles:

L. A. Arrathoon, ‘La Châtelaine de Vergy: A Structural Study’, Language and Style 7 (1974), 151-80

Linda Cooper, ‘Irony as Courtly Poetic Truth in La Châtelaine de Vergy’, Romanic Review 75.3 (May 1984), 273-82

Edelgard Dubruck, ‘La Rhétorique du désespoir: Didon et la Châtelaine de Vergy’, in Jean Dufournet (ed.), Relire le ‘Roman d’Enéas’ (Geneva: Slatkine, 1985)

Steven R. Guthrie, ‘Chivalry and Privacy in Troilus and Criseyde and La Chastelaine de Vergy’, Chaucer Review 34.2 (1999), 150-73

Tony Hunt, ‘The Art of Concealment: La Chastelaine de Vergi’, French Studies 47 (1993), 129-41

Laurence de Looze, ‘The Untellable Story: Language and Writing in La Chastelaine de Vergi’, French Review 59 (1985), 42-50

J-Ch. Payen, ‘Structure et sens de la Châtelaine de Vergi’, Le Moyen Age 2 (1973), 209-30

Ben Ramm, ‘Making Something of Nothing: The Excesses of Storytelling in the Lais of Marie de France and La Chastelaine de Vergi’, French Studies 60.1 (2006), 1-13

J. Rychner, ‘La Présence et le point de vue du narrateur dans deux récits courts: Le Lai de Lanval et La Châtelaine de Vergi’, Vox Romanica 39 (1980), 86-103

A. C. Spearing, The Medieval Poet as Voyeur. Looking and Listening in Medieval Love-narratives (Cambridge: CUP, 1993)

Paul Zumthor, ‘De la chanson au récit: La Chastelaine de Vergi’, Vox romanica 27 (1968), 77-95, repr. Langue, texte, énigme (Paris: Seuil, 1975), pp. 219-39