The daughter of Authorized was third in the Newsells Park Stakes two weeks ago but was able to go two better back on her favoured fast ground.
She was held up towards the rear by Andrea Atzeni but made smooth progress to join the leaders with over a furlong to go.
Ambivalent hit the front inside the furlong pole and, despite still showing signs of greeness, she went on to win readily by a length and a half.
Roger said: "She seems to be improving and enjoyed the faster ground. The hold up tactics suited her and hopefully she can continue to progress."
Unfortunately there were mixed emotions for the Varian team as our other runner, Zararana, collapsed and died in the closing stages of the same race. The ups and downs of racing.