I agree @PeggyHenry
It is Naive for anyone not to consider that a body can be placed somewhere after an abduction.
It happens often
The obsession that she fell in the river from the start, without any evidence to suggest this other than a river being close by and even after extensive searches didn't find her, has to come from somewhere.
I don't believe that she would have threatened to someone to do this as her partner and family didn't believe she was in the river.
I would like to know where she was for the last 23 days and how people can get so close to film the spot she was found. An area that should be crawled over with a fine tooth comb.
Until you have the results of a post mortem you have to search the whole area as to search after the results will find lots of trinkets from YouTubers, tourists and Tick Tockers.