Mrs. Nguyen, a 79-year-old woman, presents to the clinic accompanied by her daughter, who reports that her mother is "not herself lately." Over the past several weeks, Mrs. Nguyen has stopped attending her church group, has expressed feelings of hopelessness, and has unintentionally lost 8 pounds. She denies sadness but admits to feeling "tired all the time." Her past medical history includes hypertension and osteoarthritis. Which nursing action is most appropriate based on this presentation?