Rescued puppy not walking or responding to food?

We have had our 5-month-old rescued puppy for more than a week now and she still will not walk outside of the yard nor will she eat ANY kind of treat at any time, even indoors. Is there a method to persuading her to want to go for walks? What can be used to coerce/inspire a dog if food won't work? Shouldn't she want to explore, walk around the yard or the house? She seems content to lie down all day, but I'm worried if she does that she will bark all night like she did 3 nights ago. Any suggestions, remedies or people who have had similar experiences?