My opinion is she accidentally tripped and fell in. She possibly hit her head on the rocks under the water upon entry (both the police and that Peter guy stated there were rocks near the edge). I think that could have knocked her out, so she'll have gone in and unfortunately drowned silently. The dog may not have even seen it happen, as it would have been quick, and the dog could have been running around and just not noticed. This might be why it was agitated and running from the bench to the gate, looking for her. And also could explain why when Paul took the dog back the following day, it didn't show any form of reaction.
As for why she's not been found, I do think she's probably been taken out to sea by now. A young lad where I live went missing. He'd fallen in the river and after extensive searches, just like for Nicola, he wasn't found. No clothing or personal belongings were found either. But 7 weeks later, his body surfaced miles down stream. I honestly do think the police are right, and this is what's happened.
As for why she's not been found, I do think she's probably been taken out to sea by now. A young lad where I live went missing. He'd fallen in the river and after extensive searches, just like for Nicola, he wasn't found. No clothing or personal belongings were found either. But 7 weeks later, his body surfaced miles down stream. I honestly do think the police are right, and this is what's happened.