The WPPSI-IV index structure is as follows:
VCI Information, Similarities
VSI Block Design, Object Assembly
FRI Matrix Reasoning, Picture Concepts--5 scale score diff
WMI Picture Memory, Zoo Locations--5 scale score diff
PSI Bug Search, Cancellation--9 scale score diff
FSIQ Information, Similarities, Block Design, Matrix Reasoning, Picture Memory, Bug Search
GAI Information, Similarities, Block Design, Matrix Reasoning
Some context: 3 scales scores is 1 standard deviation. So the 5 scale score differences are 1.7 SD apart, and the 9 scale score difference is a whopping 3 SD difference. Typically, a 1 to 1.5 SD difference is considered significant. 2.5 SDs separate her highest and lowest index scores, which suggests interpreting her FSIQ with caution.
Notice also that her FSIQ would be higher if Cancellation were used instead of Bug Search, and Picture Concepts instead of Matrix Reasoning (probably in the mid to upper 120s). And lower if Zoo Locations were used instead of Picture Memory. Which again suggests interpreting the FSIQ with caution.
