[2] While competing at PSK Olymp Praha in Prague, Hejnova trains for the national track and field team in heptathlon under the tutelage of her personal coach Martina Blažková.

Born in Liberec, Hejnova established her heptathlon history in 1999 with a silver-medal performance at the European Junior Championships in Riga, Latvia, producing a total score of 5786 points.

Four years later, Hejnova highlighted her sporting career on the world stage at the 2003 Summer Universiade in Daegu, South Korea, where she claimed the bronze behind Australian duo Kylie Wheeler and Jane Jamieson in the women's heptathlon with a score of 5795 points.

[5][6] Despite putting up her rewarding effort in the javelin throw, Hejnova could only manage twenty-sixth place in the competition with a total score of 5716, nearly three hundred points below her entry standard.

[7][8] Hejnova is also the sister of 400-metre hurdler Zuzana Hejnová, who later claimed the silver medal at the 2012 Summer Olympics in London, and two championship titles at the Worlds (both in 2013 and 2015).