i agree, dont shout at her try to stay calm, remember to talk firmly and tell her what she is doing wrong and what will happen if she does not stop. you should think about the time out method or you could give her stickers for when her behaviour is good. just try to stick with it.
Thanks for all the great advice! I will check out the books and videos mentioned. I appreciate the help and sorry I didn't check back sooner. I've also been getting down to her level to speak to her. That seems to help. She is very quick with her apologies. I have also been trying to help her clarify why she is apologizing. Thanks again to everyone!