The David Simcock-trained Madame Chiang was slashed to 12/1 (from 50/1) by Sky Bet for the Investec Oaks following her victory in the Tattersalls Musidora Stakes at York on Wednesday.
The 8/1 shot was only having her second start in the 10 furlong Group Three event and showed signs of greenness despite landing the race by a length and a quarter from the Tony Coyle-trained Lily Rules.
Jockey Kieren Fallon was happy to play the waiting game as the Queen's Shama set a strong gallop under Ryan Moore for much of the extended 10-furlong journey.
Madame Chiang was still last rounding the home turn and plenty appeared to be going better, but Fallon persevered and his mount responded generously to run to the lead passing the furlong marker.
Lily Rules did her best to make a race of it, but Madame Chiang was well on top as she passed the post with a length and a quarter in hand.
Regardez ran with plenty of promise in third, but both favourite Cambridge and Queen Of Ice were disappointing.
Fallon was full of praise for his mount following the race and thinks there is still more to come from the filly, especially when she is stepped up in trip.
"I had to work hard on her, but we did go quite quick," said Fallon.
"She's a beautiful big filly and David had a lot of confidence in her. Miss Rausing (the owner) deserves a nice filly. She's got plenty of horses in training and I think she's got one here.
"The ground wouldn't be an issue with her and all she'll do is improve. She didn't do a tap in front and I just had to give her a couple of flicks to keep her going.
"We went a strong gallop and I thought it was a good trial."
It was a pleasing result for her owner and breeder Kirsten Rausing, whose links with Madame Chiang's family go back a long way.
"I bred her and I also bred her dam," explained Rausing.
"I've been associated with her family since the early 1970s and purchased her grand dam at Keeneland. She was three years barren as well so it's nice to see the family go on then.
"She has the most marvellous pedigree. It goes all the way back to Special who was responsible for the likes of Fairy King, Sadler's Wells and Nureyev.
"It's early days to decide whether she goes for the Oaks and we'll need to all talk and see how she is when we get back. She is so well balanced and her dam ran well at Epsom so that is encouraging.
"It's also fantastic for her sire, Archipenko, who has now had a Group winner in his first crop."
Trainer David Simcock was a little more guarded after the race though and revealed he wouldn't want to try Madame Chiang on quick ground at this stage of her career.
"She's so laid back and switched off," said Simcock.
"She races like she works at home. I've got four or five fillies, all of the same ability who are bred for middle distances, and she wouldn't be the fastest but she's got the best pick up.
"She's done really well physically from two to three as she was too weak to finish a gallop off as a juvenile.
"She surprised us first time out to be honest. She does take some stoking up but Kieren kept her entertained, didn't rush her and gradually brought her into the race. There was plenty left in the tank at the end of the day.
"The ground is very important to her and I wouldn't want to run her on firmer at the moment. If it turned up soft at Epsom, then it's possible we could run otherwise the French Oaks is much more likely."
Sky Bet's Michael Shinners was also impressed as his firm cut Madame Chiang to 12/1 (from 50/1) for the Investec Oaks.
"She's not quite a confirmed an intended runner in the Oaks but although you can say it wasn't the best Musidora, there was enough to like about her performance to put her in the mix for an open-looking Investec Oaks."