Frankie Dettori rode a first Group One winner since his return from a drugs ban as Treve won the Qatar Prix Vermeille at Longchamp.
Dettori pulled Criquette Head-Maarek's filly clear of Wild Coco in the last half furlong to win.
The Italian is now targeting further success at the Prix de l'Arc de Triomphe in October.
"It's brilliant. She is the first decent horse I've ridden for a while," Dettori said.
"The Arc will be a different type of race, so I just hope I'm drawn on the fence so I can get some cover.
"It was always the plan to ride her like that as I knew she had a great turn of foot."
Dettori, 42, was banned from racing for six months after testing positive for cocaine at Longchamp last year.