Ninjanoodle - the NV knowledge and V WM are the only two scores not fully in the gifted range. The scores are otherwise uniformly high and even. I would ask the tester if there are any reasons she might suggest that these scores were not up there with the rest and would the tester expect them to change on another day or over time?
At such a young age is it possible that she didn't fully grasp who the verbal WM test worked? Does the tester believe that the NV WM is more accurate or that her V WM is truly weaker? Is this an area that may improve with maturity (ie with the ability to listen to someone else rather than talking non stop?).
Is there a reason for the NV Knowledge being weaker?
My son took the SB5 at age 5, and in one part of the report his tester wrote, "In this examiner's experience in using the SB5, almost every young bright child has shown a significantly lower score on this nonverbal subtest than on any other subtest of the SB5; this was substantiated by personal correspondence from Deborah Ruf".
I think your advice is fine and as valid as anything I have to offer, but I wouldn't personally worry about the working memory either. I see a lot of highly gifted scores reported with a lower working memory and/or processing speed. Here the verbal working memory raw score of 14 doesn't seem that far out of whack anyway. It's a pretty well-rounded set of scores.