Abnormal anger issues in a 3 year old?

When my brother was younger, he was EXACTLY like that. We tried everything, we took him to a behaviorist, and it helped little. When he was about four, we discovered he had an EXTREME interest in the presidents. (Like where they were from, important things they did, stuff like that.) We then went to the book store and bought a couple of books on them, and also got some kid movies we found. Every night, we would all sit as a family and do something with the presidents, but only if my brother had behaved himself that day. By the time we had been doing this a couple of months, he could recite the presidents in order, he knew what the Emancipation Proclamation was, and could tell you endless facts about them. He had now found a reason to behave himself. He is now eight, and we have found his outburst are getting more rare, he still enjoys the presidents, but has other interest too, all revolving around history. So my advice to you is just try to find something she enjoys, and spend some quality time with her. Maybe it will help her like it did my brother.