I expect she probably was being cautious about score estimates, likely because several of the WPPSI subtests involve a little bit of work scoring. Mainly the nonverbal subtests, and possibly double-checking some of the verbal responses. Also, the subtests he scored really high on might not all contribute to the FSIQ, depending on which subtests she administered. It has a lot of analogs to the WISC, but it's still a different test.

...pronounced like the long vowel and first letter of the alphabet...