The weather was cold and windy and the crowd was unusually small although it included the Prince of Wales. Commenting on his trainee's chances before the race John Porter had said "she will run well, for she is a rare little sticker". La Roche was settled in mid-division before making steady progress into third place behind Lady Schomberg and Paigle entering the straight. She took the lead a quarter of a mile from the finish and drew away to win very easily by three lengths from Merry Gal, with Lady Schomberg coming home a distant third. The Oaks form received a boost on 5 July when Merry Gal scored an upset victory over Diamond Jubilee in the Princess of Wales's Stakes at Newmarket. One week after her Oaks triumph, La Roche followed up by "cantering" to victory under 107 pounds in the valuable Manchester Cup, a handicap race over one and three quarter miles at Manchester Racecourse. La Roche won again at York Racecourse on 28 August, when she "slaughtered" the opposition to take the Yorkshire Oaks from Inquisitive and Vain Duchess at odds of 1/4. La Roche had never been entered in the St Leger, for which she might well have started favourite, and so was instead matched against older horses in the two and a quarter mile Doncaster Cup on 14 September at the same meeting. Despite carrying a ten pound weight penalty she started 5/6 favourite but after leading into the straight she was overtaken and beaten into third place behind King's Courier and Merry Gal. On her penultimate start of the year she started 1/10 favourite for the two-mile Newmarket Oaks on 9 October and won by eight lengths from her two opponents. For her final run of the season La Roche was assigned top weight of 122 for the Cambridgeshire Handicap over eight and a half furlongs at Newmarket on 24 October. Racing over a much shorter distance than she had attempted since May, she finished unplaced behind the four-year-old colt Berrill. La Roche earned £8,000 as a three-year-old. In their book, "A Century of Champions", based on the Timeform rating system, John Randall and Tony Morris rated La Roche an "average" winner of the Oaks. After being retired from racing at the end of her second season, La Roche became a broodmare for the Duke of Portland's stud. La Roche was euthanized in 1920. She produced at least eight foals and three winners between 1902 and 1920: