A 28-year-old primigravida at 34 weeks' gestation presents with persistent headache, visual disturbances and right upper quadrant discomfort. Blood pressure is 162/104 mmHg on two readings 4 hours apart and urinalysis shows 3+ protein. Platelets are 110 ×10⁹/L and ALT is mildly elevated. According to Australian hypertensive disorders of pregnancy guidance, what is the most appropriate management?