Hi Dave,
I take it you mean 1851 census, as she was born 1849.

This looks like her with her Cobb grandparents - seems likely that Alexander did accept paternity of her.
Address: Wester Kinclean, Towie, AberdeenshireWilliam Cobb, head, mar., 56, farmer of 14 acres, b. Angus (no parish name given)
Jean Cobb, wife, mar., 53, -, b. Towie
Jean Cobb, dau., unm., 13 scholar, b. Towie
Mary Cobb, dau., unm., 11, scholar, b. Towie
George Cobb, son, unm., 9, scholar, b. Towie
Isobel Cobb, g-dau., unm., 1, -, b. ClattFound through FreeCen at
http://www.freecen.org.uk/cgi/search.pl.
hume