You don’t owe anyone any explaination. I know she is your best friend, but if she truly is, she needs to work on her understanding. ADHD is a neuro-development disorder that shows up on brain scans. It is 100% legit & you can show her brain scans on dr. amen clinics website: under “The Science.” You should not feel bad or shame bc someone doesn’t understand. I’m sorry about all that.