Dealing with chronic pain can be very challenging, Stess and anxiety definitely adds to the problem. I suggest that your daughter consult with a psychologist that specializes in pain utilizing cognitive behavioral therapy and other techniques to help her.
I’m so sorry to hear that she is suffering. Just because there is nothing wrong on imaging or tests doesn’t mean there is nothing wrong in her body. Sometimes people have hypersensitivity in their nerves or muscles that can cause pain. And anxiety only makes this worse. There are a lot of ways to help such as medications, relaxation techniques, physical therapy, psychologists, etc. The right consultant is key in a case like this.
The best approach is to engage the primary care physician and determine is there need for a general wellness screen. Based upon the outcomes of this, corrective action of what can be addressed should be done. The importance of stress management, sleep and treatment of depression and associated disorders cannot be overlooked and should be addressed immediately. Lastly, physical therapy should be initiated to meet the specific or general musculoskeletal problem and consultation to Pain Management is an important next step for subspecialty recommendations.