Judy Gale's World
While Judy Gale has been comfirmed as not being an Erfworld native, very little is known about the world from where she came. She might be from the Real World, Stupidworld, or even some other, as yet unidentified, world. This is an attempt to codify what is known about Judy's World.
 Proposed Canon
The world "Kill" is used in place of the word "Croak" and means essentially the same thing.
A "Year" is a term used to measure a 365 day/turn cycle. This may be exactly 365 days or (like the Real World) a 365 day and change period that is referred to as 365 days for convenience purposes and results in a Leap Year.
A place called "Kansas" exists, which implies the existence of the native american indian tribe for which the place in the United States of America was named, possibly implying the existence of the USA or a very similar equivalent thereof. It is flat, windy and smells like pig boop. It contains rural areas, implying the existence of other areas, such as urban sites.
Her use of the word 'Boop' indicates that, like Parson Gotti, certain aspects of her speech are censored. However, by the time of her disappearance, she had not achieved (or been granted) the ability to circumvent this limitation.
If Judy is 'normal' sized for humans of her world, (and has not been changed/altered in order to make her the same size as Erfworlders) this likely means that she does not come from Stupidworld.
However, as there have been no size comparisons between Erfworlders and Real Worlders, she could come from the Real World, or from some other. If she is from the Real World, this could mean that Stupidworlders are larger than Real Worlders.
Since Dorothy Gale was a pre-teen in the original Oz stories written by L. Frank Baum, it may be an indication that she didn't grow physically taller in Erfworld, similarly to the way that Dorothy didn't grow taller when she was in Oz. Judy, however, did mature physically, which didn't seem to happen to Dorothy.