www.ellisisland.org has a family Fidenza travelling in 1905, who were from Marseille. There is a child Quais Fidenza (looks like Anais), aged 5, part of a family - the shipping list is damaged, so some of the names have been lost. The mother is listed as Marie Palerme/Palermo and they are heading to an uncle in the US (Michel Palermo/Palerino). The family contains girls aged 17 and 15, a boy aged 9, another girl (age not known, sometime between 5 and 9), and then the youngest child - name on the following page.Possibly your Marcelle was the second-to-last child? Or the 5 year old and the info is off.
I think you will find them in the 1915 NY state census under Fidance with "Marcella" as "Anna". Two children with them, 'Bendict' aged about 20 and 'Eugeina' aged about 1896, which would make Marcella the baby and Eugenie(?) middle child.The father is Canio - can be found arriving into the US as Canio Fidanza.