Sue, I too am usually a solo female walker. I've just finished walking the San Salvador, and before I set off, I did seriously wonder what would happen if I had an accident somewhere on the way, when there was no-one around and no phone signal. I reasoned that if I had organised accommodation for the night, then hopefully someone would be aware that I was not where I should be. And I planned to text my family every evening too - though I had also told them not to get worried if there was no text one evening as it might be that there was no phone signal. Reviewing my trip, I'm still not sure what would have happened if I had suffered an accident, as it was not possible to reserve ahead at either of the two albergues in the more mountainous area.
On the Le Puy route, you will be reserving accommodation in advance every night, so hopefully that will alert people if an accident happens.