Born in 1788 and died on 5th November 1852 was William of Castle Dyke's youngest child. Charles Sillem Lidderdale lived with her in his school days. He painted a miniature of her.
She is mentioned by M'Kerlie in his 1876 edition, which says: "The last of the Lidderdales who lived in Kirkcudbright, was an old maiden lady, named Bettie, who died in the High Street in 1852. She was a daughter of Lidderdale of Castle Mains or, as it is commonly called, Castle Dike House. She was the youngest of the family."
She was disciplinarian and her nephew Charles invariably referred to her as his aunt Elizabeth. She succeeded in keeping him at the top of his class. That showed ability, active on the Aunt's side, and latent in the nephew's.
In a letter from J.C. MacKenzie, Kirkcudbright, to her nephew Charles, dated the 26th of November 1852, about the disposal of her property, this comes at the end concerning her death. "No further light has been thrown on the cause of the melancholy event. The idea is that your aunt was seized with some sudden illness and had come in contact with a lighted candle or that the easy chair on which she sat had done so."
Reprinted from: Lidderdale, Robert Halliday, An Account of the Lowland Scots Family of Lidderdale, 1950 unpublished manuscript.
Elizabeth Lidderdale's Last Will and Testament was written on February 25, 1847, and recorded on November 27, 1852, in Edinburgh, and on December 28, 1852, in London. The will names as beneficiaries:
Source: Public Record Office, The National Archives, United Kingdom (http://www.documentsonline.pro.gov.uk)