Answer :
The next best step in management for this patient is to administer empiric broad-spectrum antibiotics.
Given the patient's symptoms of fever, rigors, diaphoresis, and elevated postoperative hemoglobin levels, it is likely that she is experiencing a transfusion reaction. Although initial testing did not show ABO incompatibility, this does not rule out other potential causes.
In this case, empiric broad-spectrum antibiotics should be administered to treat a potential transfusion-related infection.
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