[2] On 6 May, Sibola contested the £3,100 Royal Plate over five furlongs at Kempton Park Racecourse when she was ridden by the veteran Charles Wood and finished unplaced behind the Prince of Wales's filly Eventail.

[7][8] The American filly was stepped up in distance to contest the Oaks Stakes over one and a half miles at Epsom Racecourse on 2 June and was made the 4/7 favourite despite suffering from a mouth abscess and being distracted by a cat which was released onto the track.

[9] She was facing the wrong way at the start and was left behind the other runners after which Sloan rushed her up to join the leaders after half a mile, using up much of the filly's energy in the process.

She lost more ground by running wide entering the straight before finishing strongly and was beaten a head by the 20/1 outsider Musa.

[10][11] On her next appearance Sibola started 3/1 second favourite for the £2425 Lingfield Park Stakes over one mile on 7 July and finished second, beaten one and a half lengths by the colt Harrow.

[12] At Derby Racecourse in early September Sibola returned to winning form in the one-mile Biennial Foal Stakes, beating the colt Flambard by three-quarters of a length with Musa unplaced.