I have no idea what was done as far as testing after the foal aborted. I know the breeder takes exceptional care of her animals and probably did have some sort of test done but I don't know what or the results. She was talking about this crazy awful thing that happened and it piqued my curiosity.
The search was easier then I thought. This is the quote(would have been 2009):
About 17 months ago, I had an all white filly produced by Rocking Trick (dark bay, tiny star, one sock) and Glenfiddich Fire (chestnut mare with white star and two half stockings). Unfortunately she was born dead (twisted cord). It is still puzzling to me where all that white came from.