I doubt that they normed the WJ with either grad students or 24 y/os. I'd guess that, just like the ITBS, etc., she got as high of a score as possible for that age, which was then labeled as a number that was much too high for her actual functioning at that age. However, if they really normed it with 18+ students, they really should have been students with 18+ yrs of education not just 18+ years of life beyond kindergarten.
Now I'm curious. I'll have to go look at the norming sample info, if it's available, for these tests. I'm curious if they really gave the 2nd grade ITBs to 12th graders to get GEs of 12 as a possibility, for instance. I'll let you know