Hi, You asked me if I had any tips for finind the owner of your OTTB. What I did was looked up her trainer(the name should be somewhere on the horse's papers) and contacted her. Asked if she remembered her, which she did, but not much. She gave me the name of Grace's trainer/owner. (her name was also on her papers, the top name.)
So I would do some research on the trainer and go from there.
Good luck! VB