Suggest Treatment For Frequent Nose Bleeds And Headaches

Hi, my 12 yr old daughter was diagnosed with Graves Disease 6 mths ago. 2 mths before her diagnosis, she was having daily nose bleeds episodes. Her endocrinologist wasn't concern about it & did not think it is related to her condition. She is still having nose bleeds sometimes daily & with headaches at times. What should I do as I don't her condition is improving or under control.