As a yearling the filly was auctioned and bought for 1,000 guineas by John Blundell Maple who sent her to his private trainer Percy Peck at the Falmouth House stable in Newmarket.
[6] Her most high-profile contest was the £1,800 Breeders' Foal Stakes over five furlongs at Manchester Racecourse on 9 June when she started at odds of 3/1 and finished third of the nine runners behind Hautbrion and Emita, beaten more than two lengths by the winner.
Dame President, also owned by John Blundell Maple, started the 3/1 favourite while the other fancied runners were Evermore, Silene, the 6th Duke of Portland's The Prize, Lord Rosebery's Tressure and Captain Machell's Halma.
Blundell Maple did not "declare to win" with either of his fillies but it was assumed that Siffleuse had been entered to set the pace for Dame President: Percy Peck reportedly told Loates "Your mount will stop after going five furlongs.
[8] Siffleuse started well and led the field up the centre of the course until half way when she was passed by her more fancied stablemate, but despite having fulfilled her apparent role as pacemaker she remained in close contention and engaged in the struggle for second place with Silene and Tressure.
Amid "indescribable uproar"[8] Siffleuse produced a strong late rally to regain the advantage in the final strides and win by a head, with Tressure a length and a half back in third place.
[11] At Doncaster Racecourse in September Siffleuse bypassed the St Leger for the Park Hill Stakes and started second favourite behind Tressure, who had finished runner-up in the Oaks.