SHE is a high risk missing person. Not the series of potential events.High risk of course doesn't mean "suicide" is more likely, it might mean that it makes it more likely to have a fall or more likely to get lost which seems to me more likely why you would fixate on the river. If the phone/ dog/ car had been found by a bridge, or the sea, then yes obviously, but by a river that she knows, I would be more inclined to think the high risk pointed to accident.