Thank you for your query at DoctorSpring.com
I understand your concern.
Her symptoms do suggest that she had MI. Anemia can further worsen such terminal attacks, and it takes time for the hemoglobin to come back to normal. They started transfusion, possibly because her hemoglobin was below 5. Their main target is to bring it up to 9-10, which will ensure proper oxygenation in the body.
I do not suspect anything wrong here, I can advise better if i see her reports.