Hi Aileen
I have Eliza being born in Glasgow, Lanarkshire, Scotland, in about 1822, but another member of MyHeritage, who is a great great grandson of Joseph Hudson has her born in about 1829 in Derbyshire, England. I'm not sure where I actually got my info from, but it appears I am closer to your info. It seems strange that her parents would then have moved to Ireland, then out to South Australia and that her parents surname was Campbell. If that surname is correct, then have you tried to search only for Eliza, born in 1824 no father's name given as she may have been born out of wedlock to Christina only, presumably Christina's surname at that time was Wallace. I'll keep trying to hunt down info for you and will keep you posted on this forum. Regards Christine