Marx was a student and assistant to Manuel Lopez Blanco, the head of the Department of Philosophy and Aesthetics at the University, where she was taught about the possibilities of consciousness through Hegelian theories, and phenomenological and semiotic thinking.
From 1968 to 1969 she had an exhibit at the Lirolay Gallery of Buenos Aires and was awarded the "Ver y Estimar" prize, where she was invited to join the Di Tella Institute but it was closed due to General Ongania's dictatorship.
[3] In the mid 1970s, Horacio Zavala, taught her all about Artecorreo by sending her an invite to an exhibition of rubber stamps where she became part of the mail exchange lists.
[3] During 1984 Marx helped form the Asociación Latinoericana y del Caribe de Artistas-correo in the city of Rosario with Clemente Padin, Noni Argañaraz, Jorge Orta, Susana Lombardo, and Mamablanca (Gutiérrez Marx’s mother) after their exhibit entitled Primer encuentro de arte experimental y mail-art.
[2] In 2010, she released a book entitled Artecorreo: artistas invisibles en la red postal about mail art and her career.