This thread is making me wonder again if we should have my DD10 privately tested. DS6 was recommended for testing in K by his teacher and (to my surprise) came back with a >99% on WISC IV.
If it is not too much of a hardship, yes, I would get your DD tested. I had DS6 tested primarily because of the outcome of his older sister's test results, and a comment by the tester about siblings often having scores in the same range, and I am very, very glad that I did. They have completely different personalities, different subtest strengths and relative weaknesses, but very similar overall reasoning abilities/score ranges.
I've come to the conclusion that group ability tests almost always underestimate IQ scores. Although DD did very well on the CogAT, I think she was very lucky, and the score was still a pretty significant underestimate of what she would eventually score on an individual IQ test.
