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Il compagno Don Camillo (1965) as Nadia
In this film she plays the Russian interpreter who falls in love with Gianni Garko, a journalist who is part of Don Camillo's travel in Russia.
Although this part is not the protagonist, she had one of the most evident roles since the middle of the film, around which an happy love story is made.
The films of the Don Camillo series are considered to be a "cultural heritage" in Italy, and for this, her role is probably the most important of her entire career, as well as being very well played.

Giallo di sera (1971) TV mini-series, season 1, episode 5: "Una locanda sul lago", credited, as Lili Bouval

Fratello ladro (1972) credited on the poster, role uncertain.

This hard-to-find title would appear to have been Graziella's final appearance in a feature film. The images below must be some on-set stills from the production, since Gino Cervi's suit matches that seen in other publicity.

Piccola ribalta (1972) as Presenter

Once again Graziella appeared as a hostess on this TV series, verified by articles in Radiocorriere.

There are a few mysterious listings for Graziella in Radiocorriere in the late 70's, I have been unable to find any further information regarding these shows so am uncertain about what her involvement or roles were.

Graziella appears to have totally avoided doing any publicity other than that directly related to her film and TV appearances, consequently there are very few images of her to be found.

A 1975 interview found on EBay, unfortunately photographed from an angle where much of it is missing, but it still adds and confirms a few biographical details.

Amici Nemici (2008) as Interviewee.

This is a documentary about the "Don Camillo" film series. The only copy I found was one taken from a theatrical screening (presumably) filmed with a phone, so not great, but at least we get to see how she looked in more recent years.

Peccati d'estate (1962) credited but does not appear - which might be why this title doesn't appear in any of Graziella's known filmographies, including ANICA, IMDb and Wikipedia.

Uno dei due (1972) (Tv series) (episode 6) "L'incendio", credited as Polianna Sarmenti
Graziella is included in the cast list of Radiocorriere Tv magazine.