N.,
first i would have her tested for hearing and anything else the pediatrician suggests before you think she has a behavioral problem. my son had every test there was, first he had reflux, which was causing alot of the pain but when he was mad he would just stand and clench his fists and scream, i took video of it and took it to the doctor for help, he did not get over it, it got worse, and i kept having him tested, i then took him to a councilor by time he was a little older because i was going insane. the key is to rule out medical problems first and then get counciling even for just yourself, it helps i promise. he is 14 now and is still quite head strong but does not throw the temper tantrums anymore.