The advice on this thread is very sensible.
May I recommend that women (and men) do a self defence course? There are short courses that are provided especially for women by many organisations. These courses teach not only physical self defence moves that might allow you to escape from a physical threat but also general strategies and behaviours for staying safe.
By doing a course, you won't become some kind of self defence expert instantly, but you will learn to defend yourself so you can hopefully escape. I say hopefully, because there are no guarantees in a conflict situation, even for the most experienced martial artist which is one reason why most trained martial artists would rather avoid conflict in the first place.
By doing a course, you will probably feel more confident on the Camino and this will show in your body language and posture. As a generalisation, men who target women are most likely pathetic cowards who will only pick on lone victims where the offender senses some kind of superiority.
But remember, there is before and after Camino as well. What you learn, you have the knowledge and skills anywhere, so whilst this is a Camino thread, it is nice to have confidence and awareness while walking through life generally.
You could attend a Wing Chun class (or any other martial art for that matter) and observe a lesson before deciding whether it is for you or not. I mention Wing Chun because I have been training for over six years. (Joining up at the age of 59 after experiencing a pickpocketing issue with a pick pocket man in Shanghai, China) (Age is no impediment, however some martial arts are really for the young, speedy and agile, so by being an observer at a lesson, you can assess whether your physical ability is up to it. That's why I chose Wing Chun Kung Fu at age 59. It suited my physical abilities apart from kicking (dodgy knee!))
Most good schools should welcome an observer who is thinking of joining. Ask first though
Wing Chun, was invented by a woman and it is a very effective martial art for women.
Bear in mind, that Wing Chun (and other martial arts) take many, many years of training to become proficient, however after a year, I would think that a student taking two classes a week would reasonably be able to protect themselves against bigger and stronger opponents.
The short courses for women track as I said will teach strike and escape strategies, while a martial art track will additionally teach posture, balance, anatomy, judging distance, striking without hurting yourself, attack and defence, dealing with more than one person and so on.
There are many online courses also and while these have a place there can be no better training than training with someone because you can ask questions, get lots of gentle physical practice and get to meet often very nice people as well
Hope this helps
Cheers
Graham