Deferr was born in Lima, Peru. She currently lives and works in St. Léonard, Switzerland. She received her Diploma in Experimental Photography from Ecole Cantonale des Beaux Arts de Sion, Valais, Switzerland. Other topics of study at E.C.B.A. included Film Installation and Printmaking. Earlier, she attended the Institut de Graphisme Toulouse-Lautrec, Lima, Peru. Deferr's work is mainly based on questioning certain myths related to the human condition, specifically to women. She breaks myths through exaggerating or contradicting the role of the different characters giving these characters ironic and dramatic connotations. For example, a contemporary myth of female beauty, Barbie, reflects a deformed ideal of female perfection. In a series of photographs, Deferr challenges Barbie's perfect world by placing her in situations of suffering, poverty, and chaos.
Her selected solo exhibitions include: Forum d'Art Contemporain, Sierre, Switzerland, 1995; and Ruine, Geneva, Switzerland, 1994.
Her selected group exhibitions include: Anniversary Exhibition, Forum d'Art Contemporain, Sierre, Switzerland, 1999; 1st Tour de la Bouse Fédérale de Beaux-Arts de Switzerland, Kunst Messe, Basel, Switzerland, 1994; and Duddley House, Harvard University, Cambridge, Massachusetts, 1994.