The Roger Charlton-trained Thistle Bird landed the Group 3 Princess Elizabeth Stakes at Epsom.
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Richard Hughes was content to go on at the front and looked to have slipped the field as they came around the home turn but hopes of an upset were extinguished as she rapidly came back to her field with two furlongs to travel.
Thistle Bird has been content to sit slightly off the pace and having been given plenty of encouragement from the saddle, the 3/1 favourite gave generously to score by three-quarters-of-a-length from Gifted Girl.
Doyle said: "She was a little bit fresh (at Newmarket) and she ducked away from the cameras on the inside.
"I was surprised how well she ran, considering how free she was.
"She deserves this. She was very consistent last year and I'm pleased she won the way she did.
"She stays quite well, to be fair to her.
"I didn't want to take it up too early, but I wanted to get her rolling at the same time as her turn of foot isn't instant - she gradually picks up.
"It turned out to be very straightforward."
Charlton is now looking forward to a trip to Royal Ascot with Thistle Bird.
"She's been amazingly consistent and she'll be a really nice filly to breed from," said the Beckhampton handler.
"She deserved to win a Group race and I'm so pleased for her.
"I think she goes on any ground except extremes and we'll head for Royal Ascot now for the Duke of Cambridge, the Group Two fillies' race that used to be the Windsor Forest."
The pair were comfortably ahead of Ladys First in third.
Frankie Dettori's had his first ride since his suspension but Beatrice Aurore could not provide a fairytale ending and Ed Dunlop's mare trailed home last of the nine runners.