She was known to both the Rt. Hon. Wm. Lidderdale and his cousins Wm. Halliday and Dr. Robert of the Indian Medical Service in their early youth as she visited James Lidderdale's house Loch Bank, Castle Douglas frequently. Dr. Robert said of her, "I knew in my boyhood a Miss Lidderdale of Annan, daughter of William Robertson of Castle Milk, a little woman with the manners of a duchess who always reminded me of Madame Esmond in the Virginians," a pleasing vignette. She had joined the Roman Catholics and was a friend of James Gillis., Vicar Apostolic of Edinburgh who composed, with her and one or two others a book of poems, in manuscript, now owned by the Lidderdale-Forrests. The Bishop was not a poet but may have been a humourist as his effusion, in praise of Rome, ends thus; the quotation being the last half of the poem:

Oh Rome! Once happy Rome! they cry
Thou'rt desolate like the sea!
Thy Palaces - thy gardens waste
All, all is changed with thee!
If all be changed, thought I one day
Whilst scratching for dear life,
There must have been a time in Rome
When fleas were not so rife.

On the walls of the family burial enclosure in Galtway Kirkyard are tablets to the memory of the following members of the family mostly buried there.

- JOHN LIDDERDALE of Castle Milk, son of David of Torrs, died 10th August 1777, aged 64.
- His son WILLIAM ROBERTSON LIDDERDALE died 8th July 1814., aged 69.
- His daughters:
- ELEANORA died 30th May 1824, aged 19.
- ELIZABETH died 20th August, 1827, aged 24.
- MARGARET died 28th October 1868, aged 74.

Source: Robert Halliday Lidderdale, An Account of the Lowland Scots Family of Lidderdale, 1950.

William Robertson Lidderdale succeeded to the representation of the family at the death of his father at Castlemilk, in August 1777. He succeeded to Castlemilk, and became a captain in the Scots Greys in 1775, which regiment he joined as a coronet. He sold the property. He married Julia Rae in 1789, and had issue, of whom survived,

    David, died unmarried in 1860.
    Robertson, died unmarried in 1840.
    Julia, married, in 1822, John Forrest of Long Meadow, Annan. She died in 1834, leaving issue,
        John James [Forrest], died young.
        William John [Forrest], born in 1828, of Long Meadow. He married, and had issue. He died in 1873.
            William Robertson Lidderdale [Forrest], born in 1870.
            Julia Isabel [Forrest].
         Andrew Turnbull [Forrest], born 1830. He married, and has issue,
            John Andrew [Forrest], born in 1870.
            Julia Margaret [Forrest].
    Margaret, died 1868, buried at Gata.
    Elizabeth, died 1827.
    Eleanora, died 1824.
    Jane, died 1831.

Source: P.H. McKerlie, History of the Lands and Their Owners in Galloway, 1878.

Margaret Lidderdale is buried in Galtway Kirkyard, Kirkcudbright, Scotland.