Was the testing done by a school psych or as a private eval? Was the eval specifically looking for giftedness or something else? Was there any testing done beyond just the ability (WISC) and achievement tests?
I'm not a professional, so take what I have to say for what it's worth (not much lol!)... but I'm the parent of 2 2e teens and one teen who isn't 2e but had a severe undiagnosed vision challenge which through off testing when she was younger. I don't know much about the WISC-V, as my kids were all tested awhile ago, using WISC-IV.
The psych. also noted that her achievement scores were not where she would expect them to be. I am not surprised because I have noticed that DD is not persistent, does not like to have to think, and gets frustrated super easily when she can't figure something out instantaneously (such as math). Her latest report card grades were all As with a high B in math. She has to work for her math grades which she detests having to do.
The large discrepancy in WISC subtest scores, combined with the lower-than-expected achievement scores and the behaviors you've mentioned all sound like they might potentially be indicating some type of learning challenge. Extremely bright kids can still have learning challenges. When my 2e ds was in early elementary prior to diagnosis, we knew he was extremely bright because of the level of his verbal communication - yet in school he was refusing to do work, seemed to get easily frustrated with work if he didn't know the answer right away, and he was very slow at timed tasks when writing was involved - so we (parents) thought the problem was gifted + perfectionist, when really the problem was he had a huge learning challenge that was masked by the obvious gifted strengths.
If there wasn't any testing done beyond the ability and achievement tests, I'd suggest seeking out either a private neuropsych eval or further testing through the school. You'll most likely get some better feedback here re what types of things to look for - but basically the idea is finding out what's behind the discrepancy in scores and the behaviors you've noted at school.
Best wishes,
polarbear