That is an interference engine. If something goes bad with the timing belt, the valves will hit the cylinder piston. If she shut it down quick enough, and all movement after that was by towing, a valve could have received a small enough bend that it didn't post a code for a couple of days after the bend. The hit could have damaged the head with stress damage that became worse after running again. Or it could just be a problem with the sparkplug, wire or COP. I'd check the electrical side and do a compression test.