I reckon she fell in the river. There’s just such a short space of time in between her last confirmed sighting and her staying logged on her meetings after it concluded. Like a 15-20 min window?
That’s not long enough for her to be abducted without a struggle, and have her moved to a location easily which could result in a swift escape from the area entirely (especially if she was incapacitated).
that would mean that within 15-20 mins, a predator managed to overpower her, incapacitate her, carry her to a vehicle and escape the location, with no car park or pedestrian paths nearby? It’s just not plausible.
She was in an isolated bit of the park with other dog walkers around. The dog would have followed her in this case, resulting in the risk of a creating a scene if something sinister was happening.
My opinion is for whatever reason through misadventure, something happened with her dog whilst it was off the harness, she panicked therefore leaving her phone on the bench, she was unable to get out of the river due to her clothes becoming waterlogged & the riverbank being slippery, resulting in drowning. It is a massive river which opens up to the sea. If my theory is correct it will be a while before she resurfaces. I hope she is found soon so family have closure.