The California Highway Patrol said Friday that the mystery has been solved in an early-morning accident Tuesday that left a Nevada City woman in critical condition. But her son is not so sure. The CHP had received a call of an injury accident on Highway 49 near North San Juan at about 12:30 a.m. Tuesday, and officers responded to find a Nissan Pathfinder parked at a gas station south of Oak Tree Road. Barbara J. Ryan, 48, was found in the passenger seat and had sustained major injuries. Joel Theron Webb, 33, of Camptonville, was in the driver’s seat, but …