I would be prepared to just listen to what is said, knowing that you can formulate questions and ask them later.  I had tried to take DD for a psych assessment (he just did the WJ achievement, we already had WISC results, which I gave to him), and the WJ achievement showed gaps that I thought were very abnormal, but he dismissed them since everything was in the average range or above.  I hope that the psych that you are seeing is experienced with 2e children.  Good luck, and let us know how it goes.