I think that poor Queen Frederika had to "keep her tongue' sometimes because she was critised by so many people, both politicians and the press. The British Royal family have been doing this for years. Turning a blind eye and keeping silent in the face of criticism is sometimes a very poweful thing to do. It throws your critics into confusion because they are not getting any reaction.
To react can be construed in many negative ways. Perhaps after the death of her husband Queen Frederika felt she was free to express herself a bit more, and it worked against her. Specially in Greece, where the political situation has always been like a stick of dynamite with a very short fuse. Ready to explode at at any moment. And it frequently does. My point is that I think she sometimes just had enough and let rip and said it as it was. Not a bad thing, but in Greece I think not good.
I think the Greek politicians expected her to look pretty, have no opinions about anything, open hospitals, launch ships and keep her mouth shut.