I would get some Ace Promazene from your vet. You'll have to give a guesstimated weight of the dog, but it's pretty cheap. Have it handy in case you see her again. Slip it into some smelly canned cat food and set the cat food somewhere the dog can see it and you can see the dog and food. Hopefully she'll eat it. You're gonna have to have patience and time cause it can take a while for the drug to kick in and you may have to follow the dog until she's no longer able to walk. Have a leash ready also. Or you could try using a humane trap, but that's also going to require time and patience. You can get one from Academy, Home Depot, or animal control may be able to loan you one.