A 74-year-old female with no prior psychiatric history is referred for evaluation of new-onset auditory hallucinations, persecutory delusions that her neighbors are poisoning her food, and social withdrawal over the past 4 months. Medical workup including brain MRI, metabolic panel, thyroid function, urinalysis, RPR, B12, and folate levels are unremarkable. A neurocognitive screening with the MoCA yields a score of 27/30. She has a history of hypertension, type 2 diabetes, and mild Parkinsonism. Her current medications include amlodipine, metformin, and carbidopa-levodopa. Which treatment plan is most appropriate for managing her psychotic symptoms?