Mqse De Sevigne is out of Penne (Sevres Rose), who won her first two starts in France and was later runner-up in the Listed Prix de Thiberville and the Listed Prix Occitanie. She is the ninth of ten foals and one of six winners from her dam, and a half-sister to Meandre (Slickly), a four-time Group 1 winner in France and Germany and a sire, and to the four-time winner Dogma (Mount Nelson), second in the Listed River Eden Fillies' Stakes.

The second dam Une Pensee (Kenmare) won over 2000m in France and produced four winners, among them Penne. A daughter of hers produced Gris Tendre (Slickly), winner of the Listed Prix de la Californie and the Listed Prix Omnium II.

The third dam Cleophis (Crepello) was unraced and produced five winners, among them the Listed-placed Chantefable (Crystal Palace) and Light Fantastic (Lightning). Light Fantastic is the grandam of the Listed winner Legest and an ancestress of Hector's Choice, a Group 2 winner over fences.

This is the direct female line of Apollonia (Djebel), who won the Gr.1 Poule d'Essai des Pouliches and the Gr.1 Prix de Diane.