Has your mom been out there looking too? If not maybe you should try calling for her in a way that makes her think "mommys" there. Definately bring your dog along. Was there any toy she had that made noise that she liked? Anything that would be comforting to the dog?
Just keep look and praying. You'll find her. No matter what anyones faith on here is, everyone should tell you and theirselves that she will be found.
She probably is scared. She'll come. Just dont give up!