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My DS doesn't have ADHD but has attention issues from his autism. His capacity for paying attention varies hugely depending on his stress level, his interest in the subject matter, his preoccupation with other things, and his belief that paying attention is worth his while in any given situation (rewards available or not, likely or improbable).

This sounds far more like DD than what I read about ADHD.

I think having her observed would probably be essential if we continue with more diagnosis (we may need to give the checkbook a rest for a while).