She was a natural horsewoman, winning numerous jumping contests and relay races. Raised doing ranch work, she and her husband homesteaded in New Mexico. After he died, Bernice managed to keep the ranch and increase its size and success, despite challenges to her citizenship status.
She was a devoted horse woman to the very end. At 93, Bernice asked that her son-in-law drive his stagecoach by her hospital window so she could see the horses before he drove them in a local parade. A book has been written on her life entitled, Prairie Trails of Miz Mac by Rhonda Coy Sedgwick.