A outing at the 1990 European Athletics Championships saw her pass the 3000 m heats, but fail to finish the distance in the final. This was her only appearance at the European event. She had a win at the Cross Du Figaro in December that year. Another French record came for Duros in February 1991, when she ran an indoor 3000 m best of 8:53.94 minutes. She won the French cross country title at the start of March and this proved good preparation for the 1991 IAAF World Indoor Championships held the weekend after. Duros outran the competition and won the world indoor title for the 3000 m in an improved French indoor record time of 8:50.69 minutes. She was France's first ever gold medallist at the competition proper (Gérard Lelièvre won at the precursor 1985 IAAF World Indoor Games). In the outdoor season she won the French title and also won at the DN Galan in Stockholm – her time of 8:40.76 minutes ranked her eighth globally that year. She failed to carry this form into the final at the 1991 World Championships in Athletics, however, coming last in the final by a margin of over 15 seconds. She had her third and final career win at the Cross Du Figaro at the end of the year.