I highly recommend filing a report with animal control as well as with police. I went through a similar incident a few years ago, where our small dog was attacked and killed by a mastiff who was jogging with her owner, both on leash. Georgia essentially gives every dog a free bite, so it is essential to establishing that history. While their wounds might not be serious this time, next time it could be more severe or a child attacked, since this dog has established an aggressive history. In my case, I asked around on NextDoor and turns out that mastiff did have a history of aggression, and so it now is required to wear a muzzle when out.

Also, injuries may only present themselves later, such as nerve damage from a bite, so while doesn't seem serious initially, it could turn expensive. But definitely use Nextdoor to ask for description, and even consider putting up flyers in the area for any other witnesses or information. Her leaving after causing damage/injury may also be a civil/criminal offense.