The sand banks under Shard Bridge would hold anything/anyone in my experience, when someone stole my Friends dog it ended up there, the little boy who drowned in The River Wyre ended up there, we have had virtually no rainfall of significance locally, that's where everything gets washed up if it ends up in The River Wyre, the horrible thing I've been thinking this past week is IF she does suddenly wash up somewhere, the Police have all but given anyone who had anything to do with her disappearance the perfect way of disposing of her body, it's a total clusterfuck of an investigation, the entire area should have been closed off straight away and they certainly shouldn't have been giving a hypothesis of what had happened the day after her disappearing.
I do pray she is still alive but it seems unlikely now, my Friend (the copper) is still not letting his Mrs walk their dog on her own...