How long will a dog run away for? Will she be able to find her way home?
Some are gone for a little bit and some NEVER find their way home again. Go out and look for the dog. Put up posters, contact the vet offices and animal shelters let them know your dog is missing and leave then your contact info. Hopefully the dog has a collar and tags on so if someone does find the dog they can call the contact info in the tag to find the owner.