Hello welcome to HCM. I have read your question and understand your concerns. Iron deficiency is one of the most common cause of anemia and in heart patient it must be corrected completely to avoid progression of heart disease and symptomatic relief to patients. My advice to you is - 1. Ask your doctor to give her inj. Iron preparations as it will rapidly restored iron levels in body and rapid rise in hemoglobin levels than we can kept her on oral iron tablets for 3 to 6 months. 2.If hemoglobin is very low and patient has having breathlessness than she might require blood transfusion(only red blood cells) if hemoglobin is less than 7. 3.In diet she should consume jaggery, spinach daily because it has lots of iron content. 4.You should also search for the cause of iron deficiency in her, ask your doctor whether urine and stool sample for occult blood is required or not. Don t worry treatment of iron deficiency is easy and will cause dramatic improvement in symptoms of heart disease also. Thank you. Have a nice day.