I don't think that she jumped in the river either. At the beginning I thought so. As for where she could have logically jumped in the river etc. People do non sensible things when they are in crisis.
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No signs that she was in crisis at all. And considering what an outdoors person she was she may have been a good swimmer. To walk into a river and drown yourself if you know how to swim seems like an odd way to try and commit suicide.
I think there's foul play here with with someone unknown or known to her.