Suggest Treatment For Continuous Blood Discharge During Menstruation?

Hi i am seema. I have a 14 year old daughter her first mensuration started on 2nd jan 2012 her second mensuration was in februrary but her third mensuration started at 26th march and not yet stopped has continued till date 6 may we consultated a gynecologist who first recommended transotat tablets but later on as the bleeding did not stop then the doctor prescribed duoluton tablets but as suggested by a doctor that the bleeding would stopped in 3 days but till today medicine has not yielded the desired result