Eva Pepelnak gained her first international experience in 2015 when she won the bronze medal at the European Youth Olympic Festival (EYOF) in Tbilisi with a width of 12.87 m. In the following year, she secured the silver medal at the European Youth Championships, which were held for the first time there, with 13.03 m, and in 2017 she finished sixth at the U18 World Championships in Nairobi with 12.79 m. In 2018 she reached fourth place at the U20 World Championships in Tampere with a width of 13.68 m and in 2019 she was fifth at the U20 European Championships in Borås, Sweden, with 13.13 m.
In 2019 Pepelnak became the Slovenian triple jump champion.
Personal best
Triple jump: 13.70 m (+1.7 m / s), June 23, 2020 in Maribor
Triple jump (hall): 13.32 m, February 1, 2020 in Zagreb