She could be the fat asylum patient in Giallo napoletano
(1978) but I'm not sure so I need some more opinions.
Here she is dancing with Renato Pozzetto to "Funiculì, Funiculà":
And here is another screenshot where she is more in the background:
She looks similar to the screenshot from La soldatessa alle grandi manovre
(1978), I think. What do the rest of you think?