>>>> the guys at the auction barn said to just give them a calll when i'm ready to research her past.
If you want to know for sure if she is registered/registerable, and want to get it done if possible, I would recommend that you get going ASAP, for a few reasons.
First off, the farther back in past history her previous owners get, the less likely you will be able to find them, the less likely they will remember things correctly, and etc.
Plus, if she is registerable but not yet registered, the fees to get her registered keep increasing as she gets older.
Also, if the parents have not had DNA put on file, it would need to get done-- the longer you wait, the more chance of not being able to locate the parents, or that one or both has passed away or etc.