Aloof put up a game performance to take Group Three honours in the Danny Cordell Lavarack & Lanwades Stud Fillies' Stakes at Gowran Park.
Billy Lee always had the David Wachman-trained filly up with the pace as Michael Bell's Momentary, owned by the Queen, made most of the running.
Beatrice Aurore, bidding to give John Dunlop another big-race success before he retires at the end of the season, ranged alongside but Aloof (12-1) found extra reserves in the final furlong to win by three-quarters of a length.
Shebella was third with Aloof's stable companion Esentepe fourth and Momentary fifth.Lee said: "Her form has been consistent and good ground suited her better today.
"They went a good gallop and she kept going well. She's progressing as the season goes on."