The daughter of Galileo struck over the course and distance in the Group Two Debutante Stakes earlier this month to take her 100% record to two.
She was added to the field for the Group One at a cost of €22,500.
O’Brien left in four others – Bluebell, Minorette, Perhaps and Wonderfully – as 13 fillies were confirmed.
Lambourn trainer Charlie Hills is set to run Kiyoshi, who was last seen winning the Albany Stakes in convincing fashion at Royal Ascot.
Hills said: “She’s going to run there. We are very happy with her and looking forward to running her over seven furlongs. It’s a galloping track and should suit her.”
There is a second British possible in the shape of the Clive Brittain-trained Rizeena.
She won the Queen Mary Stakes at the Royal meeting and was third to No Nay Never in the Prix Morny on her latest start.
Jim Bolger still has three entries – Craic Agus Spraoi, Peony Fairy and Prudent Approach.
Dermot Weld is double-handed with Afternoon Sunlight and Carla Bianca, while John Murphy’s Touch Of Snow completes the list.
My Titania will stick to maiden company for her second start after she was taken out of the Moyglare.
Trainer John Oxx is looking at a seven-furlong maiden at Leopardstown on September 7 for the daughter of his 2009 champion colt Sea The Stars, who made a pleasing debut when runner-up to Vallado at the Dublin track earlier this month.
“She’s in good shape. She didn’t win on her racecourse debut so she’s eligible for a maiden, which is the obvious next step,” said the Currabeg handler.
“There’s one for her on Saturday week at Leopardstown, a nice seven-furlong maiden.
“She ran very promisingly. We were very happy with her and she just got a bit tired at the end.
“The winner (Vallado) went on and won the big sales race at the Curragh on Saturday, so the form was franked.
“Sea The Stars has had a number of runners now in the last 10 days or so all finishing placed and running nice introductions.
“There’s a whole bunch of them looking like they will be winning shortly.”
Trainer Mick Halford is confident Mizzava can put a recent no-show behind her in the Dance Design Stakes at the Curragh on Sunday.
A winner on her seasonal reappearance at Limerick in early April, the three-year-old then ran two excellent races to finish fifth in both the Irish 1,000 Guineas and the Coronation Stakes at Royal Ascot.
She ran her most disappointing race of the year when eighth in the Hurry Harriet Stakes at Gowran Park last time, but Halford expects much better at the weekend.
The Co Kildare handler said: “We’re hoping to run her on Sunday if all goes well. She was in season the last day, which explains why she didn’t give her running at all.
“She’d been running well all year before that and although all these races are competitive and hard to win, I think she’s due her day.
“I wouldn’t want the ground too fast. A drop of rain wouldn’t do us any harm as I wouldn’t like to see the word ’firm’ in the going description.”
Mizzava is one of 16 fillies and mares engaged for the nine-furlong Group Three, with Dermot Weld’s Along Came Casey and Jim Bolger’s Yorkshire Oaks fourth Scintillula the two highest rated horses in the field.
Other leading contenders include Eddie Lynam’s three-times winner Pearl Of Africa, the Aidan O’Brien-trained Say and Kevin Prendergast’s La Collina.
The latter, however, may miss the race in favour of the Group One Matron Stakes at Leopardstown on September 7.
Prendergast said: “She’s not a definite runner. She was only beaten a couple of lengths in the Matron last year, so we might wait for that.”
One Spirit, trained by Frank Dunne, has been supplemented for the race after having finished down the field in the Fairy Bridge Stakes at Tipperary last week.