ballet,
It sounds like your perception of the WISC scores is that they are qualitatively consistent with the real-life presentation of your daughter, but perhaps not quantitatively entirely consistent. That, and your observation of performance anxiety-type behaviors during testing, suggest that the WISC results are probably a bit of a low estimate, but not so far off that they misrepresent her pattern of strengths and weaknesses.
I know this doesn't really help to determine which scores to trust more...but at least it sounds like there is some confirmatory value to the WISC-V results, in terms of her learning profile.
If the school accepts the RIAS, then you don't need the WISC-V results for access, anyway, and can use the data as supplemental. BTW, a lot of perfectionist kiddos tank coding, because it's timed, and scored for number of items completed, but not precision, and they make the opposite trade-off.
