I am probably one of the least qualified to respond to this thread, but here goes....
Like has been mentioned, Training is the most important and only proper beginning. And I beleive that the first thing that should be learned, by all, and especially women, is Awareness.
Awareness (call it a "danger radar") is the skill/sense that will make conflict mostly unnecessary. An instructor with real world experience once said "If you can stay Awake and Aware, you can get Away Alive." Few truer words have been spoken.
Once Awareness has begun to grow, and Training is beginning to show fruit....
Then, I feel that a Spyderco Product like the Merlin or Matriarch would be a good choice. Or, even better, a Delica or Endura, then if a -likely event- transpires, like needing to cut string or open a letter, or any one of the daily tasks needing a knife, she will be prepared for it, and the unlikely confrontation.
Another advantage of the Delica and Endura is that both have complimenting trainers, similar knives, designed to be safe to train with, while allowing you to practice all the mechanics of use.
Unfortunately, the Emerson LaGriffe and CRKT Bear Claw are both fixed blades, making them illegal in a number of jurisdictions, while the Delica is legal in a larger number of jurisdictions, be sure to know what laws you must labour under.