If she doesn't want the meds, then they are most probably harmful. Stimulants are being prescribed like remedies because they are profitable. But what may work for pure ADHD threatment also affects the autistic traits in a bad way.

I think you should focus on behavioral therapy while keeping an eye on the stress level, or she will later most probably burn herself constantly out, such as I did.

(Until recently, when I decided to refuse all the stress because it's about to get life-threatening.)