SAN FRANCISCO (AP) — One of the two Chinese teenagers killed in the Asiana Airlines disaster was struck by a fire truck while she was covered by firefighting foam, a new detail that raised the possibility she may have survived the crash only to die in its chaotic aftermath.It wasn’t clear, however, whether Ye Meng Yuan, 16, was already dead or whether she was alive after Saturday’s crash.Authorities were still trying to determine the cause of death, and San Mateo County coroner Robert Foucrault said his initial results would likely be released sometime next week. He would not comment on the police investigation.Police said the teenager was on the ground and covered in foam that rescuers had sprayed on the burning wreckage of Flight 214. When the truck moved while battling the flames, rescuers discovered her body in the tire track, police spokesman Albie Esparza said.The airliner collided with a rocky seawall just short of its intended airport runway on Saturday. Two people were killed and dozens of others injured although most suffered minor injuries. Investigators have said the plane came in too low and slow.Nearly a week after the crash, investigators have pieced together an outline of the event — what should have been a smooth landing by seasoned pilots turning into a disaster.