Highway to nowhere

A few times a year, my granny loads up her car - an aging '94 Honda, and drives for hours and hours (about ten) to visit my aunt, her daughter. Where my Aunt lives is way up north and for a three hour part of the trip you are on the highway alone, no gas stations, no homes no nothing, until you reach the end of the highway and the town where my aunt lives.

Granny always phones my aunt on the way out of the house to say she is on the road, and again at the last gas station before the lonely highway trip, so that someone at their end can time her and investigate if she is late. Should her car break down on the way, chances are she would only have to wait a maximum of three and a half hours for someone to come to her rescue.

But I still worry.

She has a cell phone, but with the forest and its requisite super high trees, it is hard for her to get any sort of signal. If she were to break down without heat from the engine, even three hours is too long for a woman nearing eighty to survive. We are trying to get my granny interested in acell phone repeater for her car so that if something does happen, she can call immediately for help, but Granny is rather against technology and its advances. The only thing she uses her computer for is to play solitaire for heavens sakes!

I think that it would be perfectly acceptable to install a repeater in her car, and just not tell her it is there, sure she might figure it out when she has full bars on her phone up north, but how mad can she really get?

Dad thinks that as long as granny is capable of thinking for herself it is rude to go behind her back and install one.

So? R-E-S-P-E-C-T or better safe than sorry?