>she ducked, grabbed his head, and smashed his face into her knee. That was the end of the attack
At this point she had every right to kick his sack until there was permanent damage. Maybe next time.
I have self-defense sessions at my church and everyone in the class typically says, “If he gets out-of-bounds, I use the knee-crotch technique.”
I always tell them, don’t stop or run away. Continue the damage until he vomits and/or passes out. Once in the groin won’t stop him from coming for more.