There is a tiny sentence in the Dundee Courier 26 November 1875 - not sure it helps but here it is:
Two Women Drowned - At Woodhall Quay, near Calderbank, the dead body of a woman has been found in the Canal, and was identified as that of a widow named Helen Gilchrist or Queen, who was 70 years of age, and resided at Greenend. On Tuesday the dead body of Isabella M'Guire or Smith, wife of a collier residing at Braehead, was found drowned in the mill-dam at Langloan. The deceased was about 50 years of age.
Joyce