First, chances are, you have nothing to worry about. I do have one question though, after reading your post. Did she get an "E" profile on the CogAT? From seeing what you posted here, that is my guess. Usually there is a "profile" that suggests how similar or dissimilar the subtest scores were. An "E" profile could be ABSOLUTELY NOTHING to worry about, but some would see an "extreme" difference between scores as a reason to take a closer look or do more testing.
The only reason I would be concerned about an "E" profile and the comprehension issues you mention is that we have known an extremely bright child who scored high, even on achievement tests, who turned out to also have a LD. It took years to get a Dx, and this child was fantastic at compensating (which "masked" the LD). Bright DC can compensate for LDs for years and that can make them extremely difficult to diagnose.
CogAT testing certainly has its limitations and from posts on this forum, it appears to "miss" many children that do well on WISC or SB tests.
You could see if the school would be willing to do individual IQ testing, to reveal your DD's strengths and weaknesses in more detail. In addition to her nonverbal strengths, she may have an excellent memory or other strengths that are not revealed by a CogAT test.
Again, it is probably NOTHING to worry about! Wishing all of the best to you and your DD!
