Looks like the spelling of her mother's surname is Cuffaro.
Here is Giovanna's birth act.
#201 - dated 7 November 1868
Presented by the midwife, the child was born to Rosa Cuffaro, 18, spinner residing in Strada Marino, and to Leonardo Zarbo, her husband, age 22, farmr residing with her, on day 6 of the current month at 4 AM.
The child was given the name Giovanna Zarbo.
https://www.familysearch.org/ark:/61903 ... cc=1946817
AND...
Marriage of Leonardo Zarbo and Rosa Cuffaro (parents of Giovanna Zarbo)
#14 - dated 15 September 1867
Leonardo is age 20, minor, farmer, born in the town, son of Nicolo, a farmer, and of Giovanna Sciara deceased.
Rosa was age 16, minor, spinner born in the town, daughter of Gaspare, a farmer, and of Rosaria Danna, spinner.
https://www.familysearch.org/ark:/61903 ... cc=1946817
T.