The daughter called for help. Trouble is, cell phone service is spotty there. It's entirely likely she had to exit the sand spit area and get back near "civilization" (if you can call it that) nearer to the roadway. Depends where they were. The parks person indicated it was a 1/2mi jog from the last spot she could park to the scene.
Imagine being the daughter. Imagine having to leave that beach knowing what happened, in order to get any sort of assistance.