Looks like Domenico only had 2 sisters. I only checked Andria 1874-1890, so the possibility of having another child born in a comune close to Andria is high, if only 3 children isn't matching up to your records/his family tree.

Domenico Ciciriello - 17 june 1876 - https://antenati.cultura.gov.it ...

Where was she in the USA ? Was she married ? Can you explain a bit more please ?