Cossie -

The only thing to do in that situation is to call the police. Take down the license number and if she leaves, the police can contact her by the registration.

In either case, you will need a police report if you intend to file a claim with your insurance carrier to repair the damage.

I see these cases all the time. It's frustrating. I'm an investigator who specializes in insurance cases. E-mail me privately if I can answer any questions for you...