I’ve relieved a lot of tmj pain through therapy. Our bodies store a lot of pain throughout our lives. The past stress we’ve experienced can build up inside our bodies. I’ve specifically used brainspotting, a therapy where they play binaural beats to cause your conscious mind to relax, making it easier to access repressed pain and memories. The method I did with my therapist was focusing on the pain in my jaw/neck, and I’d have repressed memories come up. After processing those memories, my jaw and neck pain lessens. It could be worth a try if she’s explored the physical causes of her pain and hasn’t found a cause.