Nastasja Schunk

Nastasja Schunk is not mentioned in either of the provided news articles. Both articles focus on the German women's tennis team's performance in the Billie Jean King Cup. The articles describe the team's failure to qualify for the World Group and their subsequent relegation to a lower tier. The articles mention Ella Seidel as Germany's top player in the absence of the injured Eva Lys, and discuss Seidel's loss against Justina Mikulskyte. The articles also highlight the team's overall poor performance and the disappointment surrounding their inability to advance in the competition. Therefore, based on the provided text, there is no information available about Nastasja Schunk or her involvement in these events.