Yes, you can have ADHD and autism (my son does). Often, ADHD masks the symptoms of “high-functioning” autism until later. My son was diagnosed with ADHD at age 6, I began suspecting additional autism at age 10, but he wasn’t given the additional diagnosis of autism until age 12.
It’s also possible that she has ADHD with some traits of autism, but not enough to meet the criteria for an autism diagnosis.
There isn’t medication specifically for autism, so treatment may not change much. There are some additional therapies for autism. For us, it was the extra layer of understanding that we were missing. We didn’t change treatment.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism