If she was really lost, at most, she would have to walk through 20 miles of woods to arrive to Civilization.
20 miles in a Hawai'i forest with no path?
As someone who does this regularly, 20 miles on trails might be possible in a day without gear. But off-trail? Probably chronically dehydrated for days with no remaining water bottle?
She's the fortunate one. She could have been frog food at the bottom of a waterfall if she had taken a bad step or wrong stream.