Hi, dear I have gone through your question. I can understand your concern. Your mom probably have some internal or external bleeding. Low hemoglobin itself leads to Congestive heart failure. You should consult haematologist and search for the cause. You xan go for ultrasound examination of abdomen and also consult gynecologist onve to rule out bleeding from genital tract. First search for the cause of anemia and then take treatment accordingly. Hope I have answered your question. If you have any further questions then feel free to ask me. I will be happy to answer. Thanks for using health care magic. wish you a very good health.