Hey just an update as an FYI to anyone going through a similar thing...
I talked to our school guidance counselor yesterday, and she said that typically it's only the non-verbal section of the CogAT that correlates with the WISC, because WISC doesn't really have any quantitative section. My daughter's worst section was non-verbal, and it did indeed almost match her WISC GAI. She said that my daughter will be placed in the higher level math in 2nd grade and will probably be able to accelerate to 4th grade math in 3rd grade.
Another interesting thing, though, was had she not bombed that one section (picture concepts?) of the WISC and instead got a score in line with everything else, she would have got into gifted. She only needed a 127 on WISC because all of her other scores and evals were so high. They will automatically test her again next year.
This all made me much happier about the whole thing. Really, it's not the gifted program I wanted for her. I just want her to be able to accelerate and not be denied because she's not in gifted. Apparently, our school district only uses gifted for enrichment, and acceleration is based on completely unrelated measures.