I believe your instincts are right and it sounds as if your mother needs professional help. My experience has been that someone who will not be willing to see a psychiatrist may be willing to see a regular physician. This is where I would begin. By getting her to have a complete physical you can ask to accompany her to the doctor. In talking with the physician the topic of her agitated moods will give the physician an opportunity to ask questions. Ruling out a medical cause for her behavior should be the first approach. Then the physician can make suggestions for follow-ups. I’ve found that suggestions from physicians work better than suggestions from family members.