^^ Other than the need to pay for his costs, and the risks of being stung with her costs, and the general faff and aggravation involved in litigation, no. But frankly, it's difficult to see what damages he could claim since as far as I'm aware he wasn't injured and hasn't suffered psychological trauma.
And he can't claim damages on the basis that she's successfully defending the prosecution for careless driving. For many, many reasons, the fact that she won on that score being the most obvious.
Whiplash , innit.