OK, so you have advice ( Killymoon blog 2007) from B W Leo V Stieglitz that the Anne referred to in 1837 by Martin Cash as the adopted daughter at Killymoon and who married Francis Walter Stieglitz at Avoca in 1840 stated age 22 was ,in fact, adopted, and was the daughter of Thomas Amos and Catherine MvNally. Take a bow, Leo, you are a living treasure! So the tag of adopted was a subterfuge to cover up that Anne was Catherine's natural daughter, whereas no cover up was required for Thomas born 1820 even though the registration was Father U, he was called McNally not Ransom and not acknowledged as Ransom in the will of Thomas Ransom 1829 even though he left him his estate. Very odd.
Thomas Amos died in 1819- advice Wiggy to David, per Hobart Town Gazette, but I can't find wiggy's advice and the exact date of death!
Irene Schaffer Land Musters, Stock Returns and Lists, VDL 1803-1822, shows Thomas Ransom as having a wife on the stores in the 1819 (October?). The same return does not include a Thomas Amos (dead) Neither does the Free Women on General Muster, Hobart Town 1818 (October?) include a Mrs Amos or a Catherine McNally. All Hobart, but no entries for Port Dalrymple either. The list of Free Children Off and On Stores October 1818 includes no Amos Children. Wiggy's (misplaced by me) advice from memory stated 2 boys, sons of Thomas Amos.
So, a relationship 1817-18 between Catherine, aged 28-29 ( if born 1857-68=1789) and Thomas Amos, and inconsistency of acknowledgement of the two offspring ( Anne and Thomas) of Caterine McNally.
If you are suggesting that Catherine McNally arrived with Amos from Sydney(?) 1816ish then we need to be checking Sydney records, and arrivals in VDL for Amos
David