I can't improve on your findings : (
The only scrap that may be of interest was the presence in 1851 Newcastle of two widowed brothers, John (43) and Robert (40) Savage, both labourers, born Ireland. John was head of the household which included his children: Mary (18), John(15), Rose (13) and Peter (11) all born in Ireland; and a cousin James McCeroy (36), a shoemaker, also born Ireland.
Robert and John are of the right age to be Ann's father and uncle; and the first names, although pretty common, were her choice for her own children; and the shoemaking cousin. Just a thought.
Having said that, I can't find them after 1851 ...