What cause of action will the lawsuit be based on? What elements must be proved?

Mrs. Stevenson was treated at the emergency room at Matthews Health, suffering from severe abdominal pain, nausea, and vomiting. The emergency room physician palpated her abdomen but did not order laboratory tests. She was discharged home with a diagnosis of indigestion and given medicine to lessen her symptoms. A day later, she returned to the emergency room with excruciating abdominal pain and worsening nausea and vomiting. At that time, she was diagnosed with a ruptured appendix, peritonitis, and septicemia. In this life-threatening condition, she was taken to surgery for an appendectomy and was given strong antibiotics for the next several weeks. Mrs. Stevenson filed a lawsuit against Matthews Health and the emergency room physician who discharged her home. Her attorney wants to seek economic and non-economic compensatory damages and punitive damages. Consider the following: