I alluded to that theory in an earlier post. The phone left on the bench still connected to a conference call, the dog, lead and harness still there, just a ten minute time frame. It all points to something happening very quickly, probably why the police think she fell into the river. If however somebody she knew well shouted to her, or approached her in a panic saying something terrible had happened to someone she loved, she would probably follow them leaving everything behind as that urgency would overide everything else.