Competing with Sergei Romashkin, Kustarova won the silver medal at the 1990 World Junior Championships in Colorado Springs, Colorado and bronze at the 1991 World Junior Championships in Budapest, Hungary. Ahead of the 1991–92 season, she teamed up with Oleg Ovsyannikov. The two won bronze medals at the 1992 Grand Prix International de Paris and the 1993 Nations Cup, as well as two medals at the Russian Nationals. The partnership ended in 1994. Kustarova then partnered with Vazgen Azroyan. They won the silver medal at Russian Nationals but finished 17th at the 1995 European Championships and split at the end of the season.