In early March 2008 Hejnová competed in the 400 metres at the 2008 IAAF World Indoor Championships and reached the semi finals but did not qualify to reach the final.
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She did however, reach the final with the Czech relay team in the 4 × 400 metres relay in a team which included her, Zuzana Bergrová, Denisa Ščerbová, and Jitka Bartoníčková.