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I think this is delayed hemolytic transfusion reaction (which is why it took 4 weeks and she is not exhibiting signs and symptoms of shock).
Pathomechanism: Occurs in patients who were previously sensitized to specific RBC antigens during transfusions, pregnancy, or transplantations. Re-exposure to the antigens results in a rapid increase in antibodies that bind to donor RBCs and cause extravascular hemolysis
Clinical features: Onset days or weeks after transfusion. Fever, jaundice, anemia, dark urine
Diagnostics: Antibody testing to prevent future reactions
Treatment: No acute therapy required
Regardless of whether it is acute or delayed hemolytic, they are both diagnosed with "direct antiglobulin test"