A 16-year-old female with anorexia nervosa, restricting type, is evaluated by the PMHNP as part of an interdisciplinary team. She has lost 30% of her body weight over the past eight months and her current BMI is 14.2 kg/m2. Laboratory results reveal hypokalemia (K+ 2.8 mEq/L), hypophosphatemia, bradycardia (HR 42 bpm), and a prolonged QTc interval of 480 ms. She reports dizziness upon standing, cold intolerance, and amenorrhea for six months. The team is developing a comprehensive treatment plan. Which of the following most accurately describes the critical medical considerations in this patient's care?