5 year old on Adderall 10mg XR?

My 5 year old stepdaughter is being prescribed this, as her mother wanted her tested in february for adhd. Within one week she was diagnosed with adhd. She's been in preschool for 3 months. We're currently going through a custody battle and cannot be involved with her medical issues. She does have alot of energy, but i figure its just her being a kid. The MG on her medication has been upped 3 times. When she has taken it, she was a zombie. Didnt move. Didnt speak unless spoken to. She just seemed emotionless. Her mother also has her taking melatonin. Recentley, her mother sent a note from her doctor stating she was to stop taking her meds for 2-3 days, then continue. I find all of this drastic for a 5 year old. Arent there other non-stimulant ways to treat this?