She studied and trained with junior players of the German men's Bundesliga side FC Schalke 04.

[5] Popp started her career at FC Silschede, playing there in mixed-gender teams until she reached the age limit of 14.

Popp made her Bundesliga debut in September 2008 against Herforder SV and scored her first two goals three weeks later in an 8–0 win over TSV Crailsheim.

[6] One year later, she again claimed the German Cup title and finished runner-up with Duisburg in the 2009–10 Bundesliga season.

In her first season there she won the treble with the Frauen-Bundesliga championship, the DFB-Pokal Frauen and the UEFA Women's Champions League.

At the 2008 UEFA U-17 Women's Championship, Popp won her first international title with Germany, scoring the team's second goal in the final.

In February 2010, Popp made her debut for Germany's senior national team in a friendly match against North Korea.

Later that year, she played in a European Championship qualifying match against Kazakhstan, where she and teammate Célia Šašić each contributed four goals to a record 17–0 victory.

She received the Silbernes Lorbeerblatt, Germany's highest sports honour, for her performance, along with the rest of the German team.

[13] Following a one-year internship as a physiotherapist, Popp successfully completed a three-year apprenticeship to become a zookeeper at Tierpark Essehof in Lehre.