My duaghter was diagnosed with asperger (PDD) at the age of 6 so yes. your 9 year old can be diagnosed. you should take her to a pediatric nuerologist and follow up with a pediatric psychiatrist. if she is having difficulty with school interacting with other children you should consider having her evaluated by the school system to see if she would qualify for special education services to address her social skills. i hope this helps.View Thread