A 32-year-old G2P1 at 34 weeks' gestation presents with new-onset headache, visual disturbances and right upper quadrant pain. Her blood pressure is 168/112 mm Hg, and urinalysis shows 3+ protein. Platelet count is 85 × 10⁹/L and AST is markedly elevated. According to SOGC hypertensive disorders of pregnancy guidance, what is the most appropriate management?