Raja, my pup, and I just moved back to college and she won't eat. When I give her her food she just noses it until its everywhere and keeps nosing it until it's wedged behind my desk. There was another dog where we were staying, could she be depressed?
Try offering her absolute favorite food, or a couple hot dog pieces (which dogs seem to find irresistible). Then take her for a really long walk. Keep her moving for at least a half hour. The movement will help her "do what she needs to do". If nothing happens after a half hour (or more) of activity, talk to her Veterinarian about your concerns.