[1] Holding a dual citizenship to compete internationally, she earned a bronze medal in the 48-kg division at the 2004 Asian Judo Championships in Almaty, and represented her naturalized nation Kazakhstan at the 2004 Summer Olympics.

[2] Shishkina emerged herself in the international scene at the 2001 World Judo Championships in Munich, Germany, where she scored a seventh-place finish for the Russian squad in the 48-kg division.

[4] At the 2004 Summer Olympics in Athens, Shishkina qualified for the Kazakh squad, as a 35-year-old, in the women's extra-lightweight class (48 kg), by placing third and receiving a berth from the Asian Championships in Almaty.

[2][5] Shishkina opened her match with a more convincing victory over Colombia's Lisseth Orozco by a two-point advantage on koka, before she conceded with a shido penalty and succumbed to an ippon and an uchi mata (inner high throw) assault from Romania's Alina Dumitru.

[6] In the repechage, Shishkina offered herself a chance for an Olympic bronze medal, but slipped it away in a defeat to Poland's Anna Żemła-Krajewska by a brilliant ippon three minutes and thirteen seconds into their first playoff of the draft.