By Theoden Janes The Charlotte Observer CHARLOTTE, N.C.—As a consequence of her jobs working as a server at an Italian restaurant in Concord and as a dog groomer at a south Charlotte pet superstore, Amanda Frayer has never spent much time (OK, any, frankly) fielding phone calls from reporters or signing autographs at major sporting events. But this spring, the 26-year-old Concord resident added a third occupation to her resume, and in recent weeks, this particular one managed to thrust her into the national spotlight. On Sunday, Frayer—a former college field hockey player who four months ago knew virtually nothing about professional motorsports—served as the outside rear tire changer for IndyCar driver Simona De Silvestro’s No. 16 Paretta Autosport Chevrolet at the Indianapolis 500. And Frayer wasn’t the only woman working the pit crew. Three of the other five individuals who went “over the wall” (i.e. onto the track to …