Hi Pemberley,
You'd go to the neuropsych if you want more detail about learning disabilities, developmental disabilities, or quirks that you suspect are impeding your child's progress in some fashion.
If you already have testing results that you think describes your DD well, you have a good handle on her LD situation, and you think the education she is getting meets her needs, there's probably no need to pursue it at this point.
The main downsides: it can be expensive (the local guy who doesn't take insurance charges $1800 for a full workup). (Ours, however, was covered by insurance.) It takes time (figure 6-7 hours of testing, plus parent and teacher questionnaires, plus a followup meeting to discuss the results). The waiting list to get into a neuropsych can be long. But if you feel you need more information, I don't think those are major downsides compared to the upside of knowing exactly how to proceed.
My leaning is always to have accurate information about the problems I'm solving...
DeeDee
