Александра Ивановна Колясева? Yes. She won the Tour de l'Aude, which wasn't as prestigious as the Giro or Tour equivalents, but it was still an important race at the time. She also won two TTT WC titles.
If you had asked about whether she retired before 2000, I could have been mean and said yes, but I don't really know if returning was always her plan, since her first race back appears to have been 19 months after she gave birth to Pavel Sivakov. What I do know is, that experiencing how hard it was for Koliaseva and other racing mothers to be away from their children, made her teammate during the 2000 season, Joane Somarriba, decide to retire before attempting to become pregnant.