I am trying to trace an Anne Aitken who married Dr George Buchanan on 16th October 1801 at St Andrews & St Leonards, Fife. Dr Buchanan's father was Donald Buchanan who farmed near Cupar Angus. Anne & George had a daughter, Helen, born on 29th May 1803 at St Andrews. Later on the family emigrated to Ontario in Canada where Helen met and married John Fergusson who had also emigrated having been born, I think, at Balqhidder in Perthshire.
I have no idea where Anne came from but suppose that, given she was married at St Andrews, Kettle is, at least, a possibility.