It's nice to talk with someone who actually is intelligent on this subject. When my son was in 5th or 6th grade, he was literally in tears one time because he was so frustrated about having ADHD; I just told him he was going to have to work harder to accommodate the problems it causes. Later when he was a teen, I emphasized that many, many times. My advice was to accept it, work hard, and not use it as an excuse.
As long as her grades are good - who am I to argue? Of course, she and I have different views on "good." To her anything less than an A in any project in any art class is a catastrophe of Biblical proportions; earning a D in other classes elicits "MOM! it's passing!" and a C is "MOM! I'm average! Go me!"
Deep breaths in.... long slow exhales out