Treve was a most impressive winner of the Prix de Diane at Chantilly for Criquette Head-Maarek.
The unbeaten daughter of Motivator had won two minor races before stepping up in class for the French Oaks, while many of her rivals brought Classic form into the race.
None more so than the Poule d'Essai des Pouliches heroine Flotilla, who had the perfect trip before fading inside the final two furlongs.
There appeared to be no excuses for any of the beaten horses as Treve spreadeagled the field under Thierry Jarnet, beating another outsider Chicquita with Silasol third.
Head-Maarek had been without a Group One win since Fuisse won the Prix du Moulin in 2010 and has been out of the limelight somewhat of late.
However, it seems inconceivable that Treve will not be running in all the big races from now on, such was the manner of her success.
The disappointment of the race was undoubtedly Flotilla and it would be no surprise to see her drop to a mile.
Tasaday ran well for a long way and was just out of the places but Marcel Boussac winner Silasol appeared to have every chance and was beaten on merit.