She hadn't expected him to recover from... whatever that was so quickly; she backs away again, but she obviously can't keep her distance forever, there's kind of a disparity in leg length here.

The moment he gets close to her, she drops down to grab a couple rocks off the ground - one she hurls at his leg, the other she holds up threateningly as she takes a couple more steps backward. "Hey, back off! I'm warning you!"