my youngest was diagnosed with ADHD in 1st grade when she moved to public school
it was rough and not widely recognized at that point in girls - all the school related people said she was just a problem child. We paid a small fortune to get her to a specialist who only had dealt with about 10 girls at that point, gave my kid all the tests they gave boys and she was off the chart with her DX. It was rough for all of us growing up because "girls just don't have ADHD" (told to us hundreds of times) and I had to fight for her constantly.
I wouldn't change a thing about my incredibly talented, smart, intense, artistic, amazing daughter and was glad we were able to help her like we did.
I think a lot more people have ADHD than realize it honestly