On 26 July she started odds-on favourite for a minor event at Down Royal but after briefly taking the lead in the last quarter mile she was overtaken and beaten into second place by Think Big.

[6] For her next race Millisle was sent to England and moved up in class and distance to contest the Group 3 Dick Poole Fillies' Stakes over six furlongs at Salisbury Racecourse on 5 September.

[7] Thirty-five minutes before the start of the race a British Horseracing Authority vet had taken a blood sample from the filly and Harrington felt that this may have affected her performance.

[8] Thirteen days after her defeat at Salisbury, Millisle made a second trip to England and started a 16/1 outsider for the Group 1 Cheveley Park Stakes over six furlongs at Newmarket Racecourse.

Millisle began to make progress approaching the final furlong, and sustained her run to overtake Raffle Prize in the closing stages and win by one and three quarter lengths.

Millisle started the 4/1 joint second favourite but after being in contention in the early stages she dropped away and came home seventh of the fifteen runners, ten lengths behind the winner Love.

Ridden by Foley, Millisle raced in second place behind the favourite before taking the lead two furlongs out and quickly drew clear to win "readily" by four lengths from Pronouncement despite being eased down in the final strides.