Clarion Area resident Gabriele Bigley has been injured in a traffic accident, in south-central Clarion County.     And,she was flown to Pittsburgh's U-P-M-C Mercy Hosptial for treatment.     Bigley had been driving a car on Route 68, in Monroe Township.     For unknown reasons, her vehicle veered off the highway.     Bigley's car then struck a legally parked vehicle before eventually coming to a stop.     This wreck took place just before Nine Monday morning.