Of all the jaw-dropping feats that a Thoroughbred is able to accomplish, perhaps nothing is quite as miraculous as watching a fierce, powerful racehorse transform to fill the role of motherhood. Wayne Sweezey, who owns and operates Timber Town Stables alongside his wife Cathy, has watched this dramatic role change hundreds of times. But one mare on his farm in particular has excelled above and beyond both on the track and with a foal by her side. She won 13 of her 15 starts, never finishing worse than second, and...