Am I too cynical? I think what I am asking is, does she demand an explanation like Obama demanded Guantanamo to be closed and whistleblower laws to be strengthened?
Germany is somewhat of an economic powerhouse, but paradoxically radical innovation is culturally frowned-upon. This means that German tech is usually not ground-breaking but incrementally-improved-to-death (by heavyweight scientists with a lot of clout). Since there is reason to believe that a large part of all this spying is simply industrial espionage on behalf of big US companies, I believe the German government is afraid the local industry will quickly lose even more ground than it already has. Since innovation in this country doesn't move very fast, the damage would be long-lasting and potentially devastating.
Therefore I think the U.S. has an interest to seek a solution that Germany and other countries with significant economy are happy with.