Are these the marriages for your KELLYs?
New Zealand BDM marriage
1873/10858 KELLY Ann marr. O'CONNOR William
1884/3439 KELLY Patrick Thomas marr. WILLIAMSON Sarah Isabella
* The marriage record for Patrick Thomas KELLY, married 1884, would name parents. This would be useful for your research because you would hope that parents are also notated on the record as being (deceased).
* You know that father Patrick KELLY died, 1858. It would be useful to see how mother Elizabeth is recorded on the marriage record of a son/daughter ....(deceased)?
* It would be useful to locate a death record for Elizabeth KELLY, and hope that it is 1875+ when good information is included in a death record, New Zealand.
* Where/how do you see your Elizabeth, married Patrick KELLY, to be born MALONE?
* A printout would be of more use to you than would be a certificate for BDM records, New Zealand.