I am so sorry to hear that! I agree that you should put up posters. Maybe talk to some neighbors and ask if they have seen her? Whenever my dog ran away we would hop in the car and drive around for a bit and see if we could find her.
I'm sure your dog will return home as she will miss you and get lonely. Best of luck, I really hope you find her!
I agree with what everyone else has said, my friend's cat disappeared one day and it turns out he had managed to get himself stuck in an abandoned house down the street. Of course, sometimes cats just wander off to return a couple of weeks later. Don't lose hope!
’Twas brillig, and the slithy toves
Did gyre and gimble in the wabe;
All mimsy were the borogoves,
It was so weird. She's been gone for 3/4 weeks. Me and mum were stood outside the back door having a fag right, and was talking about worried we are, and that mum doesnt think shes coming back and that she'll put posters up over the next few days. And I just tried calling her a few times, then a few minutes later, we heard a meow and looked at each other, then heard it again and I ran out onto the road and she was there!! EEEEEKKKK xD