Did growing up in front of camera take a toll on Hayden Panettiere?

At 11 months old, Hayden Panettiere appeared in a Playskool toy train commercial. By age 4, she was a recurring character on the soap opera One Life to Live . In the decades that followed, she starred in movies and television shows. Rarely was she out of a job. But like many wunderkinds, Panettiere, who died Sunday at 36, frequently seemed burdened by her success. Her well-documented struggles —…