I tried finding the video of the German ZDF broadcast of the 2008 Beijing Olympics with Sandra Maischberger hosting but couldn't find it. However, I did find a lot of comments about her one-sided anti-Chinese demonization. They said that during the entire ceremony, she was using analogies with negative connotations and imagery for virtually everything. Supposedly, there were 2 main instances that stood out among a 3 hour long anti-China diatribe. The 1st was when she said "the Polish athletes are coming out next, get ready for an important message". Needless to say, nothing happened. The 2nd was when she was getting impatient near the end because of the lack of anti-China political messages when the Portuguese athletes came out. As soon as the Portuguese raised those banners you mentioned, she was excited that it would be the long awaited anti-China political message she kept talking about when it turned out to say something like we love Beijing. Epic fail! LOL I wish I had that video for my collection. At the end of the ceremony, Sandra Maischberger said it was a giant propaganda show with no substance and ended the broadcast.
Concerning the interview with Helmut Schmidt, she does an interview with him almost every year so I don't know which interview you're referring to, but the links I read has her asking him negative loaded questions about China in every interview. Closest thing I found to him saying "stop your nonsense" is when Sandra Maischberger pressed him on what Germany should do where he says "That's the beer". Is that the interview you're talking about or was that a bad translation? What does the term "That's the beer" mean in Germany?