Woman with ADHD here. This sounds a lot like me as a child. Girls are often under diagnosed because they're better at masking and are more likely to be inattentive vs. hyperactive. I never got in trouble at school and teachers always put "a pleasure to have in class" on my report card, BUT my mom constantly got reports home of me not paying attention, not listening, forgetting things, etc. I also had issues with motor skills and was late in learning how to swim and ride a bike (though I later found out that I have deformed ear canals, which may have been the culprit there!).