Q. A 28-year-old G2P1 woman comes to her obstetrician for her routine antenatal visit at 28 weeks of gestation. She has a history of type 1 diabetes mellitus and her first pregnancy was uneventful. However, her blood type is O negative (O-) and her husband's blood type is O positive (O+). Physical examination is consistent with gestational age. Lab investigations show a negative anti-D antibody screening test, and her hemoglobin and platelet counts are within normal limits. The ultrasound shows appropriate fetal growth and no anomalies. What is the most appropriate management for this patient regarding Rh immunoglobulin (RhIg) administration?