The only self-defense I know is "hit them in the balls and run".
When I was new here, I was working like a horse, I would go home 12 midnight or later. My senses would be on high alert until I was safely home. My phone would always be in my hand with the "9" ready and my fingers in the number 1 so can dial 911 right away and my other hand would be holding a....
... travel size bottle of hair spray.
When assaulted, pepper spray is meant to be sprayed in the eyes giving you a time to run (see pictures below). Hair spray can also sting someone's eyes giving you time to run.
Though I was given a real pepper spray years after I've been using hair spray as a pepper spray, I still rely on my hair spray tucked away in my bag just in case.
A girl needs to find a way to be safe.