Agnes's death in 1907 it seems.
From the National Probate Index (Calendar of Confirmations and Inventories), 1876-1936, it shows:
Name Agnes Lugton Young
Death Date 19 Apr 1907
Death Place Duns
Confirmation Date 26 Aug 1907
Confirmation Place Duns, Scotland
Her son, James Young living at Teviot Cottage, Duns is named as the executor to her will.
Monica