I found a death record for a Katherine Ellenberger. Could this be Borbala’s mother?
https://www.familysearch.org/ark:/61903/3:1:3Q9M-CS8S-57Y4?i=479&am...
I think it’s likely they’re related as they both die in Vaal within a year of each other and I can’t find any other Ellenbergers in the Kajaszo records.