Wonderful retired to paddocks.
The Luca Cumani-trained filly will go to owner Helena Springfield Ltd's Meon Valley Stud, where she is to be covered by Peintre Celebre.
"There's nothing else for her now," said Cumani (left). "The Champion wasn't a particularly satisfactory race as the pacemaker, Happy Valentine, didn't go fast enough. She was held up last, which was perhaps not the best tactical decision in the circumstances. By the time she moved up, she got blocked and the race was over.
"But we're very proud of what she achieved. She won the Sun Chariot at three and the Group 1 at York this year. She's a beautiful filly who's given enormous pleasure. She'll make a marvellous broodmare."
One place in front of One So Wonderful on Saturday was Mutamam, who trainer Alec Stewart felt might have benefited from a stiffer pace.
"I thought he ran very, very well," said the trainer, "and he'll be an even better horse next year."