Thank you for this thread! I have read it, and a few others on executive function, over the course of the last week and then attended a 2E conference on the weekend where the keynote speaker's point was essentially that ADHD is not an attention or working memory disorder, it's Executive Dysfunction and that the gifted are more prone to it.
The speaker's perspective gave me great insight into my own daughter (and husband) but has also had me thinking a lot about whether Executive Dysfunction is really just a euphemism for ADHD.
I think HowlerKArma's comment here is an excellent distinction to keep in mind:
She's actually doing better than "typical" in terms of her age-mates, according to everything we can find on the subject. The problem is the inappropriate expectations placed on her because of the (marginally?) more appropriate academic setting.
My own DD is not average (let alone better than) for her age, so I am confident there is an issue there. But do you define whether a child's executive function is problematic relative to their intellectual ability (and thus what they are trying to do with their time) or their age?
I am so distracted by my toddler that I am not sure if I made any sense there, so I apologise if this seems like a completely crazy ramble.