Yah, the sandhi isn't shown in transcription; what I meant is that tone sandhi doesn't seem to be expressed when the second character is neutral tone, e.g. nü3zi. Given that it is expressed in na3li3, it would seem odd of the second character is really neutral tone in putonghua.

Does your teacher pronounce her [ʐ] as [z]? Many Taiwanese people I've heard inconsistently pronounce their retroflexes as alveolars; while some people do indeed pronounce it as [z], usually they seem to get that one right. So I'm curious.