I know that a lot of people are considering why Willow wasn't wet and I suppose that could be for a variety of reasons. But as far as I'm aware dogs are very clever when it comes to water and generally don't go in where they recognise danger... eg. it being too deep, a long way to jump in, something in the water etc. So if Nicola had fallen in, drowned, or even gone in of her own will... I don't believe that Willow would have followed regardless if she thought it wasn't safe. Or if the water is the 15-18ft we've been hearing about, Nicola could have just fallen in, gone under and couldn't get back up bc of either clothing, something in the river itself or the coldness shock and Willow wouldn't have seen her again... also signifying danger to her. So I don't think the "but Willow was dry" thing is a lot to go off of.