Bonaly began the season with a pair of senior international medals – gold at the 1990 Grand Prix International de Paris and bronze at the 1990 Skate Electric. Making her final junior appearance, she stood on top of the podium at the 1991 World Junior Championships in Budapest, Hungary. After taking her third national title, she competed at the 1991 European Championships in Sofia, Bulgaria. She was awarded the gold medal ahead of two German skaters, Evelyn Großmann and Marina Kielmann.