Her link to the Sutherland family see http://www.geni.com/projects/The-Pedigrees-and-Heraldry-of-the-Murrays/12890 based on

JanetSutherland, [daughter of William Sutherland, 9th of Duffus], married as his second wife, to George Ogilvy, first Lord Banff.[11]

[11] P. C. Reg., 2nd ser., iii. 263.

https://sites.google.com/site/fivegateways/alphabetical-index-s/sutherland/suth0054

and http://www.fionamsinclair.co.uk/genealogy/Caithness/Rattar.htm where the only connection so far found is

SIR JOHN SINCLAIR, KNIGHT, the first of this family, was third son of John, Master of Caithness, and was styled of Greenland, but his descendants have been designed of Rattar. He married Janet Sutherland, who was probably of the Sutherlands of Forse, since his nephew, Francis, son of his brother, James of Murkle, married also a lady of that family.