L'affare Beckett (1966) as Luicita, an agent working for Steve
Rossella appears in a couple of scenes, but the role quite small and anonymous, and she is not credited in the English-language version I saw. However, this version has extremely brief credits with only six actors listed, so it's quite likely she might be crediteded in the Italian version.
Very short, uncredited role in Da Berlino l'apocalisse (1967) as Julien's girl. She only appears in the first scene of the film - in a car together with the protagonist Julien Saint-Dominique (Roger Hanin), who disappoints her by declaring he is leaving to go off on a mission and then kisses Rossella goodbye