Sorry to be pushy about this but she was last seen within a few hundred feet of a creek that has cost quite a few lives. There are a lot of possibilities but who would reasonably question that the most likely scenario involves that creek? Fast water often has branches that will catch a person. If she fell in and was swept underwater against a submerged branch she would probably not have been able to get free.
An abductor is possible. Also possible she just felt too stressed and knew some place she could retreat for a while, an abandoned cabin or whatever.
But 90%+ at this time that the creek is where she is. All of the theories and ideas about other things lose weight until the most likely scenario is checked. From the video interview of her she looks like the kind of person who wants to save every last person, help everyone without really looking after herself first. Hopefully there is some good outcome. Still without new signs any effort should probably be first focused on the most likely place.