BBM
I guess the rule of thumb in this case is: "So let's not search at all."
All I can say is this, if there is a legitimate reason why LE has decided not to actively search for this lady as many in here have surmised, then they at least owe the parents an explanation for what that reason is. They can keep the rest of us in the dark, they can keep the media in the dark, they can keep her co-workers in the dark.......but they owe it to her parents to do the decent thing. Just tell them why, I'm sure they can handle it.
As far as her friends and family go, I would think getting out and searching would be somewhat therapeutic, at least you feel like you are trying to get some resolution. It beats sitting at home on your office chair, wringing your hands in front of the computer all day.