Thrilling forum

Sugar Colt (1966), credited, as Woman doing shooting practice

A sexy little role in Il suo nome gridava vendetta (1968) as Prostitute

Quando l'amore è sensualità (1973) as Party guest who performs striptease
A small but certainly very memorable role - unfortunately one of Rossella's last.

A few biographical details I've managed to dig up about Rossella Bergamonti:

It looks as if her real name was actually Rosetta Bergamonti and she is from Gussola, a comune in the Province of Cremona in the Italian region Lombardy. In 1962 she participated in the Miss Italia beauty pageant and although she didn't win, she finished in third place, earning the title of Miss Sorriso (i.e. Miss Smiles).
Here she is on the left together with Raffaella De Carolis (Miss Italia 1962) and Maria Lina Carreri (who came in second place and was crowned Miss Cinema). Picture taken from here

And here she is on the right From the La Stampa newspaper 3 September 1962

On 2 September 1962, La Stampa also featured an article where a small presentation is given of the participants in the Miss Italia pageant. About Rossella it says that she is 20 years old (meaning she must have been born in 1942) and that she is 172 cm tall
And here the little text about Rossella in La Stampa 3 September 1962, mentioning that she is from Gussola and that she came in third place
Her first known film roles are from four years after she participated in Miss Italia, but I think it's quite probable that she played some uncredited roles during the years in between, so we should be on the look-out for that.

Un uomo, un cavallo, una pistola (1967) as Mrs. Stanley
Once again a short but notable role for Rossella. She's not credited neither in the English version, nor in the Italian (seconda edizione).
She and her husband are travelling by stagecoach, but when making a short stop to freshen up, both she and her husband are shot to death

A Ghentar si muore facile (1967) as a barmaid who flirts with George Hilton
Another very small role and uncredited - at least in the Spanish version.

Johnny Yuma (1966) Saloon girl

Roma come Chicago (1968) Post office employee

Rare press photo for the TV variety I giramondo della canzone (1971)
With the singers Rocco Torrebruno (left) and Robertino.

L'affare Beckett (1966) as Luicita, an agent working for Steve, credited as "Rosella Bergamonti". Rossella appears in a couple of scenes, but the role is quite small and anonymous.