Suggest Treatment For Mood Swings In A Patient With Alzheimer S Disease

My sister has early on set Alzheimers.. 5 years...She is 58...She lives in assisted living but I am her companion 40 hrs Monday to Friday...There is agitation on weekends and they want her on meds. Her family care doctor said go see her Psychiatrist but that doctor say she needs to see the nueologist...Who treats mood swings of alzheimers patients????