Since the previous owner sold her as a pet at a low price, good possibility they did so because she was no longer breeding sound. In looking at the AMHA pedigree that was posted, the mare was never DNA'd, and because the sire and dam are both deceased and never DNA'd, it would not be possible to determine her pedigree through that route. HOWEVER, there is an extremely slight chance that if she had any offspring that were DNA tested, you might be able to determine if this in fact the same mare going that route (would have to be processed through UC-Davis). My suggestion: call the AMHA office and talk to the person responsible for processing DNA to see if they would accept that....and then the next question would be - are they willing to process a transfer of those papers to you. My guess is that the answer would be "No" - but it doesn't hurt to ask.