 In July 1935 Nagle entered the field trials of the Irish Setter Association near Ruabon in North Wales, competing in the Open Stake for Irish Setters and the Puppy Stake for Irish Setters, for puppies which were born the previous year. At the 35th International Gun Dog League trials held at Douglas Castle in August 1935, she was awarded a diploma in the Champion Stakes for Pointers and Setters. The following month, Nagle took the silver perpetual challenge trophy in the Open Stake of the field trials of the Devon and Cornwall Pointer and Setter Society at Newlyn, near Newquay, competing with her Irish Setter Sulhamstead Baffle D 'Or. At the Kennel Club field trials for pointers and setters in April 1936, she entered Sulhamstead Bluff D'Or into the All-Aged Stake and was awarded the Penheale Challenge Cup by Captain N. R. Colville for the "best constitutioned dog or bitch, displaying the greatest game-finding ability". At the 18th annual Scottish Field Trial Association's field trials for pointers and setters at Yester estate in Gifford, East Lothian, Scotland in August 1936, Nagle won first prize in the Brace Stake with Sulhamstead Bluff D'Or. The Kennel Club own a pastel painting by Cecil Aldin of two of Nagle's Irish Setters, the Field Trial Champions Sulhamstead Sheilin D'Or and Sulhamstead Valla D 'Or. Field trials saw a general downturn in popularity of Irish Setters competing in the 1930s; during the following decade the breed was principally represented by Nagle's dogs. Nagle had eighteen Irish Setter field trial champions during the period she was active in the breed from the 1920s to the mid-1960s. The male dog Harlequin of Knockalla was pivotal in the revival of the Irish Red and White Setter breed in the 1970s; he was a descendant of Nagle's Irish Setter Sulhamstead Natty D'Or, so the Sulhamstead bloodline is behind most modern day red and whites. Nagle withdrew from the field-trial scene in the mid-1960s following the retirement of her handler, George Abbott.
