Flynn Effect aside, an obvious concern is comparing the SBV with the WPPSI-IV. Scores vary between tests for a wide variety of reasons, it would be more relevant to compare the WPPSI-III with the WPPSI-IV.
Just thinking of my son, he scored extremely high in quantitative reasoning on the SBV but I know his processing speed is notoriously slow. If they replaced quantitative reasoning with processing speed as one of the subtests I have no doubt his scored would have dropped at least 10 points, throw in the Flynn Effect and we are at least 15 points lower. If he was 15 points lower than what the SBV score says he is now he would struggle to qualify for a gifted program. Instead, because he took the SBV, he qualifies easily while doing year 1 math after he comes home from pre-school.
All that aside, she may well be on to something. Time will tell us more.
