Found it floating around Facebook with comments praising the queen for behaving like ordinary people.
Did the Queen Elizabeth actually queue for a sandwich in this photo? Or something else is happening?
The image is a real1 image of a cardboard Queen. (http://www.bz-berlin.de/berlin/die-queen-macht-ueberall-in-berlin-eine-gute-figur).
That reference mentions "von Pappe", which means "of cardboard", and in context ("nicht von Pappe") may be a pun.
Regardless of what that actually means, the reference also contains these photos, which clearly show what appears to me to be a cardboard stand:
1. I haven't found evidence eliminating the possibility of cosmetic digital post-processing.
No, the Queen isn't queuing for a sandwich in this photo. It turns out be a cardboard cutout of Queen Elizabeth II or a photoshopped image. Several images were posted on Berlin.de on June 23, 2015 16:43. They were attributed to photographer Charles Yunck.
According to Berlin.de,
Origin: B.Z. war mit der Queen quer durch Berlin unterwegs. Die 89-Jährige ist eben nicht von Pappe und macht überall eine Top-Figur.
Translation: BZ was with the Queen through Berlin go. The 89-year-old is not simply of cardboard and cuts a great figure.
Some other variants are below:
Also another video was found, indicating that it is a cardboard cutout:
While searching, I found a high quality version of the image here, zooming in: