A 6-year-old mare has died after suffering a racing injury at Santa Anita Park, the 11th horse to die from a racing or training injury at the Arcadia track this year. Shangrilama was injured in Friday’s ninth race. According to the official race chart, she “pressed the pace from outside, could not keep up with LONG MAYSHE REIGN and chased two wide around the bend, finished willingly down the stretch, sustained an injury at the wire and was trans…