They took the cast off already? Is she wearing a brace or a sling then?
I suppose you can count yourself lucky that she didn't hurt herself any worse than she did. Broken arms aren't all that bad. When I was born I had a large cyst in my left humerus, like 65% of the bone was a cyst. They though it was bone cancer at first. Anyways, because of the cyst, that bone has always been weak and I went through 6 arm breaks by the time I was 8. The last couple of times I was more calm than my parents about it. I was at a friend's house both times, and had the friend's mother drive me home both times where I would call my mom or dad at work and simply say "I broke my arm again."
Just make sure she stays off of that elbow until it heals properly, because if it was a bad break she might have to worry about arthritis later.