Popp's transfer marks a pivotal moment for women's football in Germany.
The move to a third-division team highlights the evolving landscape of women's sports.
This transfer could inspire more female athletes to pursue professional careers.
Briefing: Alexandra Popp and Borussia Dortmund: A sign of the times
Strategic angle: Germany's most famous female footballer has signed for a third-division team, signaling significant changes in the women's game.