In 2015, Valentine played in 16 tournaments on the LET and her best finish was T17th at the Mission Hills World Ladies Championship and Hero Women’s Indian Open.
In 2014, Valentine had her most successful year to date as she claimed her first win on the Ladies European Tour with a two-shot victory in the Turkish Airlines Ladies Open at National Golf Club in Antalya. The 26-year-old from Paris carded a final round of three-under 70 in hot and breezy conditions to end on a three-round total of seven under par, with Denmark’s Malene Jorgensen second on five under after a closing 73. From 18 starts, she posted two additional top 5 finishes including 4th at the Helsingborg Open.
In 2013, Valentine enjoyed her most successful season on tour. She played in 18 tournaments and recorded 5 top-10 finishes including a career-best finish of 2nd at the Hero Women’s Indian Open at Delhi Golf Club. She also posted a career low 65(-5) during the second round of the Lacoste Ladies Open de France and ended the season ranked 10th on the ISPS Handa Order of Merit with total earnings of €97,685.48. Derrey was also ranked 2nd on total birdies rankings, as she made 164 throughout the season.
In 2012, Valentine played in 10 tournaments and posted her career best finish with a tie for 6th at the Lalla Meryem Cup in Morocco. She ended the season ranked 85th on the ISPS Handa Order of Merit.
In 2011, played on the LPGA Futures Tour where she won the 2011 Tate & Lyle Championship in Decatur, Il. Finished seventh on the order of merit earning membership of the LPGA in 2012 in category 17. She also competed in six events on the Ladies European Tour (LET) in 2011 with a season best tie for 33rd at the Hero Women’s Indian Open. She returned to Final Qualifying School and earned the 28th card in category 8a.