Hi Anne Marie,
Nothing like a brick wall with obstacles in front of it to cheer me on!
However, I think I eventually found the baptism record on FS, under John Robertson and Mary Anderson.  As John and Ewen are inter-changeable I should really have thought of this earlier...
Based on several baptismal records, I believe this to be Ann Robertson's family, her father was a mason:
1841, point of Sleat, Skye:
Ewn Robertson   50
Mary Robertson   41
Anne Robertson   20
Cath Robertson   17
Alexr Robertson   15
Duncan Robertson   12
Ewn Robertson   10
John Robertson   7
Janet Robertson   5
Anne Robertson   2
1851, Rhy of Aird, Sleat:
Mary Robertson   48
Ewen Robertson   19
John Robertson   16
Janet Robertson   13
Anne Robertson   11
Flora Robertson   8
(don't know where Ewen is)
1861, Point of Sleat:
Ewen Robertson   68
Mary Robertson   58
John Robertson   28
Flora Robertson   18
Angus Mcdonald   28
Janet Mcdonald   24
Ewen Mcdonald   2
Alexander Mcdonald   2 Mo
Alexandrina Mcdonald   4
Janet MacDonald is nee Robertson.
1871, Point of Sleat, Ewen has died:
Mary Robertson   63
Duncan Robertson   38
Ewen Mcdonald   12
Alexr Mcdonald   10
The remainder of the family in 1881, Point of Sleat:
Duncan Robertson   50
Mary Robertson   80
Flora McPherson   40
Donald McPherson   6
John McPherson   5
Again, Flora is nee Robertson.
So I think they probably were her parents - the ages match up - just!!