Happy New Year!
I can't really tell if you are still looking for help with this, but will assume yes.
Using the information that you have supplied, I was able to find a possible answer to your question of where Catherine Jacobs is buried.
* There is a record of a burial listed in the TAMIOT (Tombstone and Memorial Inscriptions of Tasmania) transcription records compiled by the Genealogical Society of Tasmania. The entry reads:
JACOBS, Caroline D: 30 Oct 1855 - 33 yrs - St Marys Roman Catholic Hobart H006/00168
Although the first name has been transcribed as Caroline, and not Catherine, the date given in the record matches the information that you supplied.
This would be enough for me to want to rule out a transcription error of the first name. Perhaps an investigation of the original tombstone or memorial is warranted, in order to rule this person in or out of your research.
* I accessed this information through a digitised edition at my local library, but I believe the original work would have been published as a microfiche. I tried to find the key that would have explained what the H006/00168 means, but I could not find it in the digital edition that I accessed. From memory, it is included in the microfiche set, but perhaps someone else here might know where to find it, or have access to it. I can see on the internet that it is now available as a CDROM. In any case, at least you have a cemetery name!
I hope that this helps, Kim.
Regards,
Paul