Yes, the PSI from WISC-V can be used for A). A) and B) can actually be the same test. B) is just supposed to distinguish between learning disabled and intellectually disabled students.

And what she really means by "the technical manual for WISC-V/WIAT-III discrepancy is not available" is that her district did not choose to purchase the online scoring platform for her to run the discrepancy!

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