She has diagnosed ADHD and I think this might be one of the reasons but I still don’t understand. She sometimes spends hours working. If she had spent that time with pen and paper she could’ve reached the same conclusions she did with AI but with more understanding of her work.
This is absolutely a thing. ADHD fucks the reward center of your brain, so you don't really feel a lot of satisfaction from working (or any at all). If you spend that time with a pen and paper it just feels like a waste of time, even if you complete the job you set out to do. There's still the reward at the end of the task, but the work itself does not feel rewarding. Medication helps, but it's not magic.
What you're basically telling her is "spend more time miserable" and are surprised she won't.