I have a sister with an undiagnosed adult ADHD(severe). For a while, she suspected that she has ADHD, but because she can hyper-focus and has done well in school, she is in denial. Although others, including myself, get frustrated, she seems to be fine at least in appearance. She thinks she just needs to work on the problematic areas, and believes that she will get better. So, I wonder if the diagnosis will do her more harm than good as it will bring her spirit down and she will resign to the fact that her difficulties are due to ADHD. What do you think?