Sad to say, but at this point there isn't much hope of finding her. Searchers on the local news where quoted as saying they are puzzled that they have not yet found her or even any signs of her. Were she on any of the trials in the area, she would have been located by now.
That rises the distinct possibility that she might have slipped and fell down a cliff or was swept down the river at the ford.
A bit over 10 years ago, a woman from Montreal stopped at Pinkham Notch and went for a walk - never to be seen again to this day. It is possible for people to simply vanish into the woods, even in areas which are fairly high traffic and after an extensive search.