She is a two-time Russian national champion, having won the heptathlon in 1993 and the indoor pentathlon in 1999.[1][2] She was twice winner at the Décastar meeting (1993, 1995) and on her first victory she set a meeting record in the high jump of 1.91 m (6 ft 3 in).[3] This was her speciality event and she holds a personal best of 1.95 m (6 ft 4+3⁄4 in) overall.[4]
Blokhina ranked third in the world for the 1993 indoor season, in which she set a career best total of 4669 points for pentathlon in Moscow.[6] Her personal best in the heptathlon, 6703 points achieved at the 1993 Décastar, ranked her second among Europeans that season behind Germany's Sabine Braun,[7] and fourth at global level – her highest career ranking.[4] As of 2018, her career best ranked her 25th on the all-time heptathlon rankings.[8]