Last year’s Roodee winner Light Shift went on to score in the fillies’ Classic and bookmakers were taking no chances with Johnny Murtagh’s mount - now a best priced 16/1 - after this half-length verdict.
Having opened up at 3-1 on course before going off the 9-4 favourite, the daughter of Sadler’s Wells made steady headway rounding the turn and flew down the straight to peg back Sugar Mint, who reportedly swallowed her tongue.
O’Brien was absent, but Ballydoyle representative Tim Corballis said: “It was a trial today, but an important trial for us.
“She was very green at Leopardstown but coped well here and is a well-balanced filly. I think Aidan will be very pleased with that and there is plenty of scope there.”