A 28-year-old primigravida at 32 weeks of gestation attends a rural health centre in Uttar Pradesh for antenatal care. On examination, her blood pressure is 160/110 mmHg, and she has 2+ proteinuria on urine dipstick. She denies headache, visual disturbances, or epigastric pain. The nearest tertiary centre is 60 km away. What is the most appropriate immediate next step in management according to RCH guidelines?