I agree she is close by, and even though this looks very suspicious, we shouldn't rule out that she might have fallen in to a ravine, etc. I don't know the terrain or whether that suggestion is even plausible. And, I'm sorry to suggest this, but self harm shouldn't be ruled out either. Is there any indication whatsoever that this might even be a rational possibility?
I doubt she fell into a ravine with phone,checkbook, clothing being strung out. Looks staged.
No searches make no sense. They have to know something.