Are the "more tests to follow" with the same psych or with other types of providers that you've been referred to? What type of follow-up testing has been recommended? Is it testing for reading or dysgraphia-related issues or other? Did the psych perform any executive functioning tests? (these are all just curiosity questions from another 2e parent.. no need to answer if you don't feel comfortable doing so!).
Re your dd's 504 - what does she actually have in it now? Did your psych give you a list of recommended accommodations? Or a game plan for accommodating the dysgraphia looking forward? Did your psych mention why he recommended an IEP rather than a 504? (there are good reasons to seek an IEP, I'm just asking relative to what the psych felt your dd's specific needs were).
I am also curious if anything was mentioned about vision - relatively low processing speed scores combined with difficulty reading (and dysgraphia) might indicate that the challenges are due to vision issues (there can be other reasons too).
Good luck as you advocate! And keep us posted!
polarbear