In '51 Amelia Mackie is at Katherine St, South parish, Aberdeen city. Aged 32 born Insch, ABD a teacher of reading and writing, and a dressmaker. Son George Smith is with her, a tailor's apprentice aged 12, born Insch. His birth date on IGI was 22 Aug 1838, baptised 13 Sep - if you download the OPR baptism record for George from Scotlandspeople.gov.uk there may be some baptismal witnesses worth chasing up.
In 1841 the 2 of them are at Braes of Foudland in Insch (see Freecen.org.uk under "Amelea Mackie") with pauper William Mackie 76 and Jane Cruickshank 71.
This couple seem to have married 5 May 1799 at Gartly, ABD with the banns also being recorded at Cairnie on 21st April. The Gartly OPR reads: "April 14 1799 Willliam Mackie in the parish of Cairny and Jean Cruickshank in this parish were contracted in order to marriage & married May 5th."