I'm not sure if this is still an active search of yours, but I'm a Pryzibilla and have a copy of the Family History published in SA in 1994.
There's an entry for Mary Eileen Przibilla, the daughter of John Charles Przibilla and Rose Anne Smith. The dates I have for her are mostly estimates - only her birthdate of 8/1/1904 is taken from an original document. She is reported to have died on 5/10/1993 and to have been married in 10/1941. Her husband Thomas Farrelly was born 1/6/1898 and died 15/10/1967.
The book has a photo of Tom and Mary Farrelly, and the text says:
"Mary Eileen was born at Mount Bryan and was baptised at Burra on 24 January 1904. She attended the Leighton School, but left at an early age to help her parents. Later she went to work for a family in Hawker until her brother, Carl, had to be looked after when he came out of Burra Hospital. Following her marriage to Thomas Farrelly, they moved to Adelaide. She was known as a person who was willing to help others."
There is no mention of any children.
Hope this of assistance.