Dear Diane,
The answer to your question is I do not know. Further research is necessary.
With regard to Thomas Craig's wife. According to John Finlay: "The chronology suggests that this Katherine Bellenden must have been the sister of the Justice Clerk; Sir John Bellenden had three daughters, including one called Katherine. According to a brief by Edinburgh Town Council on behalf of Thomas Craig’s brother John, addressed to the University of Frankfurt on Oder, Thomas was the eldest son of a marriage that dated back to around 1540–1541 (information from Dr John Durkan kindly passed on to the writer by W D H Sellar, University of Edinburgh)."
The Early Career of Thomas Craig, advocate. By John Finlay
http://eprints.gla.ac.uk/37849/1/37849.pdf
The name Katherine Ballenden, or Catherine Bellenden, was not uncommon in sixteenth century Scotland. Two examples follow:
1
21 December 1535: Discharge by Queen Margaret to Robert Boyd of the Whitsunday and Martinmas Mails of the lordship of Kilmarnock, who, at her Grace's request binds himself to pay to Mr Francis Bothwell and Katherine Ballenden, his spouse, the sum of 400 marks.
National Records of Scotland
https://catalogue.nrscotland.gov.uk/nrsonlinecatalogue/details.aspx...
2
28 May 1541: Commission by Anthony, cardinal priest Sanctorum IV Coronatorum, addressed to the archdeacon of Glasgow and to the provosts of Methwen and Seytoun, for confirmation of a feu of the kirklands of Killeith or Kildeleith in the barony of Kirklistoun, sheriffdom of Lynlithquhow, in favour of Oliver Sinclar of Petcarnie and Catherine Bellenden, his spouse, of the diocese of St. Andrews, granted by David, cardinal archbishop of St. Andrews, with consent of the chapter. Dated at St. Peters
National Records of Scotland
https://catalogue.nrscotland.gov.uk/nrsonlinecatalogue/details.aspx...
Sincerely,
Neil
