You know, if you're going to be getting off of heavily traveled highways and transiting rural roads with little traffic, I think that a satellite emergency beacon wouldn't be a bad idea.
Though reading, it says that she didn't intend to be on said road, so a satellite emergency beacon might not be a bad idea at all.
Though reading the article - it says that she didn't even have her cellphone on her, so there's a double no-no, I think. Cellphones are great emergency devices most of the time.
Hell, from what I understand, even the "last seen location" can give the police a good idea on where to start looking.