@Dominions Son
Instead of having the pixie/fairy not know what a Barbie doll is, you could have her know where the deign came from. Back in the 1950s when Barbie was created, Mattel borrowed the design of a German adult novelty doll.
I also have to laugh because the article showed pictures of the two side by side, and mostly commented that the US version is "whiter".
Actually not. The dolls from the first years were originally the same color as those were, and as modern dolls. But the vinyl they used to make them tended to have the color leech out, causing them to turn white or ivory color over time. In fact, this is often a "tell" if a doll is an actual original, or a reproduction.
If you ever look for one for sale and the color is like a modern one, it is likely a fake. Or been restored and repainted. Like most antiques, such normally decreases the value.
https://www.ebay.com/itm/313602578681?hash=item49042b98f9:g:ImYAAOSwSRNg7kA7
The Lilli was also not marketed at children. The high cost, mature subject, and V neck on the box illustration (which went clear to her waist and revealed most of her breasts) made that immediately obvious. Plus, only 130,000 were made and normally sold at places like adult book stores and tobacco shops.
But similarly sized and figured dolls were made in France back in the 1800's, but were normally porcelain. At the time that Barbie came out, plastic was just becoming common in dolls, and many older ones were actually made of paper.
But the idea of a "doll" would hardly be unique, dolls over 4,000 years old have been discovered at archaeological sites. Just explain that it is a doll based on an adult female instead of a child.
And a 2nd century AD doll from a Roman crypt is amazingly like the modern Barbie. About 10 inches tall, made of wood with movable joints and with an adult female figure.
https://3.bp.blogspot.com/-ibCEkORyoow/Ui24sgxz03I/AAAAAAAAEnY/qTkQ5UPF3es/s1600/Snodi.jpg