She won a 1500/3000 m double at the French Athletics Championships the year after and was selected to represent France at the 1984 Summer Olympics in Los Angeles.

Her continental track debut for France came at the 1986 European Athletics Championships in Stuttgart and although she was eliminated in the heats of the 1500 m, she managed eighth in the women's 3000 m final.

[6] She began the 1988 season with wins at the Cinque Mulini cross country meeting and the French Championship race.

[4] That year she ranked second over 5000 m at the IAAF Grand Prix Final, finishing as runner-up to Britain's Liz McColgan.

[8] She suffered an injury, missing the rest of the season, and returned to action at the 1990 IAAF World Cross Country Championships held in Aix-les-Bains.

[6] She competed over 10,000 m at the 1990 European Athletics Championships in Split and came away with the bronze medal (her first on the track) and a new French record mark of 31:51.68 minutes.

[4][11] After the track season, she took to the roads and won the 3 km race at the Giro Podistico Internazionale di Pettinengo in Italy.

[6] Sergent's career began to decline and in 1992 she came 27th at the 1992 World Cross Country race and failed to make it out of the 10,000 m heats at the 1992 Barcelona Olympics.

[14] She made her eleventh World Cross Country Championships appearance at the 1996 edition and finished 24th in the women's long race, ranking sixth with the French team.

[4] That year was the last of her athletics career and she brought it to an end with a win at the inaugural Lille Half Marathon race, taking the title in a time of 1:11:21 hours.