1976: two-year-old season Campaigned exclusively in the North of England, Mrs McArdy made little impact in the earliest part of her racing career, finishing unplaced in her first four races before winning a
maiden race over five
furlongs at
Newcastle Racecourse. She then made steady improvement, winning a
nursery handicap race over six furlongs at
Thirsk and the Prince of Wales's Nursery over a mile at
Doncaster, receiving fifteen pounds from the runner-up, Fair Season. On her final appearance of the season, she took her winning run to four with a victory in a minor race over six furlongs at
Redcar Racecourse in September, beating Sarasingh by three quarters of a
length.
1977: three-year-old season On her first appearance as a three-year-old, Mrs McArdy finished unplaced in the seven furlong Tote Spring Handicap at Doncaster in March. She began to show good form in training gallops, however, and was strongly fancied when she ran in the Tote Free Handicap at
Newmarket Racecourse in April. Carrying 112 pounds and ridden by the lightweight jockey Taffy Thomas, she won by two and a half lengths from the
colts Baudelaire and Brighthelmstone. Two weeks later, Mrs McArdy, ridden by Eddie Hide, started at odds of 16/1 for the 165th running of the 1000 Guineas over the Rowley Mile course at Newmarket.
Cloonlara, the leading two-year-old filly of 1976, started 6/4 favourite, with the other leading contenders appearing to be Freeze The Secret,
Sanedtki, Flota Armada, River Dane, Icena, Miss Pinkie, and Danseuse Etoile.
Durtal, regarded as the best British filly of her generation, was withdrawn on the eve of the race. Hide tracked Cloonlara before sending Mrs McArdy into the lead two furlongs from the finish. Mrs McArdy established a decisive advantage and was never seriously challenged in the closing stages, winning by two lengths from Freeze The Secret, with Sanedtki narrowly beating Cloonlara for third. Mrs McArdy was then moved up in distance to contest the
Oaks Stakes over one and a half mile at
Epsom Downs Racecourse in June. As she was the daughter of a sprinter, there was serious doubt about her ability to stay the distance. She was in contention until early in the straight but then rapidly faded and finished thirteenth of the fourteen runners behind
Dunfermline. Unusually for a British classic winner, Mrs McArdy was then asked to concede weight to colts and older horses in a handicap race (the Fen Ditton Stakes) over a mile at Newmarket in July. Carrying 133 pounds, she took the lead approaching the final furlong and won by two and a half lengths. Timeform described her performance as "a striking achievement". Mrs McArdy became agitated before the start of the
Sussex Stakes at
Goodwood Racecourse and failed to reproduce her best form, finishing sixth behind
Artaius. In August, the filly was assigned top weight in the Strensall Stakes over seven furlongs at
York Racecourse. She took the lead two furlongs from the finish and won by a length and a half from the
Molecomb Stakes winner Be Easy, despite being eased down by Eddie Hide in the closing stages. On her final appearance of the season, she finished third to
Boldboy in the Sanyo Stakes over seven furlongs at Doncaster in September. ==Later career==