She was librarian of The Edward P. Taylor Library & Archives of the Art Gallery of Ontario in Toronto for 32 years, where she was responsible for its collection of books and periodicals.

She spent the period of 1916–1917 in Odessa, Russia, where her father installed the Romanian Senate and some ministries in exile, owing to the German invasion of Romania.

On the family's return to France in 1922, Pantazzi was enrolled in a women's private school with an international student body, south of Paris, graduating in 1931.

On the outbreak of World War II, Pantazzi joined the Romanian Red Cross as an ambulance driver near the front lines.

In spring 1946, Pantazzi and her mother Ethel were granted an exit visa for a visit to Canada, by the new Communist government.

Parts of her collection of Victorian and Edwardian bindings, her research base for her pioneering articles on that subject, were donated by her family, respectively, to the Thomas Fisher Rare Book Library and to Massey College at the University of Toronto.

To the Fisher Library also, the family donated her collection of books by Vernon Lee with her research on the subject.

She also was a devoted collector of Pinocchio and gave many items to the Osborne Collection of Early Children's Books in Toronto.