Ok, thanks Eastowest and Alwaysbehind that clears that up. I was getting confused ready some of the different sites as they were saying some conflicting things.
I may try to give ApHA a call. I know her age, her last registered owners name and her barn name may be part of her registared name. I also know the barn name of the colt that she had right before he bought her. The problem is my uncle is no longer able to communicate very well and sometimes he will try really hard to answer our questions but we can not always get an answer. He has communicated her age and that he did get papers when he bought her.