Please do not be so quick to diagnose children with ADHD!
The trouble with our school system is that it is outdated and is basically geared towards creating "cogs" in the machine of industry. Think about what you've learned at school and the basic reason why education exists.
While there are many high minded reasons for education, the most practical is to make sure people can do the jobs they are expected to fill when they finish school.
But what has this got to do with TS's problem with his kid?
She is measuring her kid's behavior against the established "checks" we have for making sure a child can become a productive and effective "cog" in the industrial machine. That has its purposes and actually ensures the kid's future.
However, humans have a ton more potential than that. And the way we focus on the requirements of industry in terms of education tends to blind us to other possibilities our children have. Think how many painters, dancers, writers and inventors we lost because we could not give our children some time and space to learn, explore and create for themselves!
This is not a unique point of view, by the way. This isn't a visionary idea. This is well known and our school system and, potentially, our future as a whole is in danger because of it.
See this video, OP. It's interesting and entertaining and explains things so much better than I could:
Ken Robinson: How schools kill creativity | Video on TED.com