It's not that easy to knee the guy in the balls if he just overpowers her. He probably grabbed her by the neck and shoved her against a wall or a table and most of his weight was probably pressed against her. In that spot, she probably couldnt even move her legs, much less lift it up high enough to hurt him. Probably couldn't reach his eyes either. By him having scratches on his chest, I would guess that her arms were trapped in between their bodies, and all she could do was scratch his chest.
Maybe if she gave him a nipple twister... what's that called... a purple nurple?