“I’m being bullied by a 6 ’3” man,” a New Jersey woman wrote on Facebook last week. “Bullied to the point I’m afraid.”

It was apparently not her only warning. Lauren Kanarek, a dressage rider, said on Facebook that she had gone to the police and tried to report a well-known dressage trainer to the U.S. Center for SafeSport, a nonprofit organization that investigates various forms of misconduct in Olympic sports, and to the United States Equestrian Federation.

“It’s very complicated,” she wrote. “I’m not sure of what I can say here, but it seems as if SafeSport was created for exactly this reason.”

Five days after posting that message, Ms. Kanarek was shot multiple times on Wednesday at a riding stable in Long Valley, N.J., a rural town about 50 miles west of New York City. She was taken for emergency surgery at Morristown Medical Center in Morristown, N.J., according to the mayor of Long Valley, Matthew Murello. Her condition was not made public.