It's the combined ideas of the Infinity Mirror, Pepper's Ghost, and the library scene. The combination is something that wasn't really done until her project.
Infinity Mirror and LIbrary scene were absolutely done before she did it, yet see no place she attributes the originals...
Nor even those who created the book nooks before her.
What is fair for the goose should also be fair for the gander.
Edit: That said, I've absolutely had things stolen and sold of mine. It's not just China that does it. Hollywood and other places absolutely will steal your stuff if they think they can get away with it, and many major companies will also.
The bigger questions she should be asking if she is really concerned is not to each individual company she is pursuing to try to get them to stop, but the major one which allows them to operate in the first place. Why is that online company or companies allowing this to be sold in their marketplace?
If she is really that concerned, she can go after them with lawyers.
However, as I brought up (and I am not a lawyer) seeing how much of her idea existed prior to her creation, I don't think she's going find a lot of luck going the legal route as I feel she may have done similar things in her creation.
The difference is, it doesn't appear she was trying to mass produce it and gain a profit off of it. Those on Amazon...obviously are trying to get a profit off of it.
Which brings up the next point...did she file for a patent (if this really was an original idea), or a trademark, or some other way that would legally protect her idea?
If not, she may be up the creek anyways.