The dog whisperer on TV reccommends that you feed your dog once in the morning and once in the evening. If you leave it out all the time you won't know how much the dog is eating. I feed my German shorthaired pointer a cup in the morning and a cup at night. My daughter has a pure bred lab and she feeds her 1 1/2" cups in the morning and in the evening. It depends on the size of the dog and the exercise they get.
One thing you can try is to put an egg on top of the food. I give mine an egg once in a while for a shiny coat. You might try putting some water on the food but make sure you take the food up at least an hour after if she doesn't eat it.
I am sure she will settle in soon. You should feed her the same time every day.