Later in her career, she conducted paleobotanical research at the Bernardino Rivadavia Natural Sciences Argentine Museum and worked at the Darwinian Institute of Botany.

[2] Ragonese taught plant anatomy at the University of Buenos Aires in the Faculty of Exact and Natural Sciences.

Ragonese was awarded a CONICET scholarship in 1971 and conducted research at the Jodrell Laboratory of the Royal Botanic Gardens, Kew in London.

She collected fossils of terrestrial plants and spermatophytes from 1967 to 1981 alongside Elisa G. Nicora and Encarnación Rosa Guaglianone.

[2] Ragonese conducted research in the paleobotany division of the Bernardino Rivadavia Natural Sciences Argentine Museum in Buenos Aires.