I now have that copy of the death certificate for Christiana Greves, female age 22years, who died on October 27, 1853, in Newick.
On it she is shown as the wife of William Greves (Groom). The cause of death is shown as phthisis:
Definition of Phthisis
Phthisis: A good trivia or crossword item. An over-consonanted Greek word meaning "a dwindling or wasting away." Pronounced TIE-sis.
Phthisis is an archaic name for tuberculosis. A person afflicted with tuberculosis in the old days was destined to dwindle and waste away like Mimi, the heroine of Puccini's 1896 opera "La Bohème."
The informant is shown as Sarah Budgen present at the death.
I think that all the little bits and pieces have now been, if not proven, well and truly fitted together, and I have little doubt now that Christiana was indeed my G G Grandmother.
Unfortunately this still leaves the marriage record (if indeed there was one) and birth record of the son William somewhat clouded, but another piece is set solidly in the jig saw. The search is not over but at least one chapter has closed.
Thank you all for your kindness and assistance in this matter. It certainly helps to know that such an abundance of help is so readily available.
Cheers from Australia,
Malcolm.