A 28-year-old multigravida at 32 weeks gestation with gestational hypertension is referred for ultrasound due to a fundal height 3 cm below expected. Imaging shows estimated fetal weight at the 3rd percentile with oligohydramnios (AFI 6 cm) and **absent end-diastolic flow (AEDF) in the umbilical artery**. Maternal blood pressure is 148/96 mmHg, and urine dipstick shows 2+ proteinuria. Fetal heart rate is 140 bpm with normal variability. What is the most appropriate immediate next step?