Robert Kelly and Margaret have the following children christened at Saint George Douglas (per the IGI):
Eliza, June 10 1810 (mother shown as Hiddekal)
Elizabeth, Nov 8 1812 aged two at christening (mother shown as Whitecare)
Margaret, April 10 1814 (Whitecare)
Augusta, November 8 1812 (Whitecare)
Jane, March 13 1816 (Whitycoar)
Note that there is also a christening for a Margaret Witticor (mothr mary, no father on Decenber 5 1809.
Also, in the 1851 and 1841 census Margaret is shown a being born in Cumberland (as is her sister in 1851).
It is likely that both Margaret and George were from England, possibly returning there before he died. She is alone in 1841 and no burial on Brian's index.