OK everybody, especially Twiggy, my post 99 and all previous information I have provide on the origins of Catherine McNally , aka Mrs Ransom and later Christine Stieglitz are wrong.
I am advised that the 1823/4/5 General Muster of NSW shows Catherine McNalty per Sydney Cove resident in NSW, an adult employed by Mr Hassall of Bringelly, Ref 31584 page 374. As an adult she is too old to be the child with Catherine McNalty on the Sydney Cove 1807. In my original research I stopped following the trail in NSW past 1820 when I found the 1810 marriage of Catherine to Bryan Overend and the Norfolk Island and VDL connection between Thomas Ransom and Bryan and the McNally connection to Thomas.
My apologies to all I have mislead- my only excuse being that network based web research in 2009 provides easier access to more checkable information than travelling 200km to trawl through hard copy on archive shelves in a limited time. However, sorry for the trouble caused, folks.
So Catherine McNally in Hobart with Thomas Ransom was either her maiden or widowed or married name, or an assumed name She either came to VDL with Thomas on the Kangaroo in late 1814, or was already in the colony, or came to the colony between 1815-1819. According to her gravestone she was 68 in 1857, so born c 1789, but the 1843 Census for "Killymoon" shows no married female over 45 ie c1797, so she shaded her age or the enumerator got it wrong. There was a "reason of long standing "why she could not marry Thomas which did not stop her marrying Stieglitz in 1830, so prima facie the reason lay with Thomas and ceased with his death.
Lets start again
David