I have seen a lot of frustration on here, about the insistence "She fell in the water" I cannot believe how frustrating it must be for the family, I really hope that the police are just keeping things close, and not just wedded to the idea and have confirmation bias (although can it be confirmation bias if there's no evidence?)
MOO Theory: Anyway, have you seen the pictures on google maps of the field? There is a dog walker in one of the pictures, and when I was looking the thought occurred, I can see the dog pretty well, I can see the colour of the coat and trousers, but that's it. I don't know if I could recognise my own child at that distance. We know Willow, and the phone were in that field at 9.10, but all we know is someone who matched NBs description was in that field with Willow off the lead. I am no longer sure we can say NB was in that field at all. We know she sent a text message at 8.53, and there doesn't appear to be anything suspicious about the text, and we know she dropped the kids off at school. But that's actually it.
I get A LOT of teams calls/ meetings. It annoyingly bleeps when a call comes in, so the fact that she signed in to the meeting at 9.01, but if we have a 9am meeting, most of us sign in at 8.59am. (I would guess they have asked is it usual shes late?)
Speculation bit: What I'm saying is, if we extend the timeline to she dropped the kids off 8.43, walked towards her normal walk, met the other dog walker and sent a text and 8.53, the chance of something happening to her becomes a lot more possible. If it was planned, an accomplice wearing black clothing, maybe not even planned just incidental, walking the dog and the phone to the "edge of the water" to place the idea shes fallen in. Would be seen at a distance as NB. But CCTV would show a completed different person, not suspiciously leaving the field. I also speculate that if you were carrying someones phone to create an artificial timeline and a teams call started, you might after a few moments of indecision decide to "join" on mute and camera off to seem that the phone was with NB later than it actually was.