Kicking a man where it REALLY hurts is always a viable way self defense. But she has to be ready for his real anger. The kick better be HARD and ON TARGET.
Better for a woman to practice to hit your palm to the bottom of his nose, trying to jam the nose bone into the brain. You get one shot, after which your arms may be held. If you do the eye gouge, hold the ears for leverage.
If you do a kick, the attacker's knee is best, using foot heal or ball of toes. BUT you must practice it, a lot. The type of kick does not leave kicking leg hanging, it is retracted quickly after each kick.
I was trained in Germany. The best defense is kicking and hitting, if you cannot out run, not wrestling.
But they must be well practiced before you need it.