Yes, I think the girl you are referring to had written a dream book that had many interesting elements. The one you are referring to involved the
" quaternity," which was a concept that the deity involved 4 distinct characteristics. This was a common belief in the Hermetic philosophy of the middle ages, but virtually disappeared with the concept of the trinity.
So how would a little girl know about the concept of the quaternity, a concept that had been dropped for hundreds of years?
After studying some 80,000 dreams in the coarse of his career, and seeing repeated symbols of ancient culture, especially alchemy, I think Jung was pretty convinced that there is a very real psychic connection between people that is independent of cultural exchange.