Thank you polarbear for the very thorough response. At first I was hesitant to hear the tester would be testing on the WJ III, seems like so many here are tested with the WISC. Based on your reply I think this will be a very good test for my dd. We're not entirely sure what is going on, we suspect it could be dyslexia but she also fits ADHD, auditory processing difficulties, and dyscalculia. If I recall correctly the other tests she will be given are:
Comprehensive Test of Phonological Processing
Test of Word Reading Efficiency
Gray Oral Reading Test
and I believe the WJ achievement test
She knows that she will be tested, she just doesn't know we have an actual appointment now. She is an anxious child and I am concerned that if I tell her too far in advance she will stress herself out. I may even wait til the morning of the appointment because she already has a hard time falling asleep as it is.