Content won the Pertemps Network Yorkshire Oaks to give trainer Aidan O’Brien an eighth victory in the race.
The 3-1 favourite, ridden by Ryan Moore, finished ahead of second-placed You Got To Me and Emily Upjohn in third.
O’Brien has now trained four of the past five winners of the race and is just one victory behind Mathew Dawson and Sir Michael Stoute – who are record-equalling nine-time winners.
Content went off keenly in the 1m 3f 188y grade one race at York, and Moore acknowledged it almost cost her before she came good in the final furlong.
“If she had done everything right she would have won easily. It’s taken a while to get her to do things right and she’s still not there,” Moore told ITV Racing.
“My only thinking in the race was to try and get her to relax, which I didn’t achieve, and then it was a case of making the best of a bad situation.”
O’Brien praised Moore’s handling of the the three-year-old filly as the jockey chalked up his fourth win in the race.
He added: “Ryan gave her an incredible ride as she’s not straightforward or easy.
“The pace was stronger today and she did keep coming. She was a very brave filly and will be better in a faster-run race.”