Basically what the neuropsych said is that her problems with writing are due to executive functioning issues and ADHD. It's not "just" ADHD. So she has problems planning what to write, organizing her thoughts, getting it down on the paper. She is slightly better if someone scribes for her or if she types, but not much. If you ask her to tell a story, she has problems even with that and will resist. But her speech/language is very articulate and she has no problem with communicating her thoughts verbally. She has some characteristics of dysgraphia, but her motor skills seem fine. Her handwriting is generally very neat (whereas my DS has handwriting that looks like chicken scratches and I think someone could more convincingly make the argument that he has motor dysgraphia). Basically what the neuropsych said is that she needs a lot of scaffolding with writing. She needs to use a template, she needs help with planning, etc.
She also resists copying anything, doesn't like to show work for math, doesn't like to take notes. I think all of this is also related to EF and slow processing. Her copy speed/fluency is somewhat delayed for her age (the number of words she can copy per minute). You can find copy speed tests online and try giving them to her (if you can't find it let me know, I can find it). You can also google CBM written expression problems/writing fluency where you give her a starter sentence/phrase and then time her and see how she falls in terms of norms. DD tends to sit there blankly, says she has no idea what to write, and comes out a couple grade levels delayed despite having solidly average writing scores on tests like the WIAT/WJ-ACH and TOWL-4 contrived writing. She completely bombed spontanteous writing on the TOWL where she had to look at a picture and write a "story". She didn't even write 40 words in 15 min. which is similar to what I saw on the CBM probes I gave her at home. Of course, the school never cared about any of my writing samples. The one classroom writing sample they found, she wrote 2 sentences, but those two sentences, I guess, were sophisticated sentences (probably because her VCI is 99th percentile). It's a case of giftedness masking a disability. She is also able to "cover up" her ADHD symptoms pretty well when she wants to, making me look crazy. She did great on the CCPT (computerized test for ADHD) so it's hard to tell how much of her issue is ADHD and how much of it is processing issues. I know that stimulant medication helps her though.