Are there any other symptoms? Upset stomach, coughing/sneezing, etc?
A really common issue, which happens to almost everyone I know who has had a young puppy, is overfeeding. Most people just feed their pup as much as they will eat right away, and the change in environment plus the change in food can be VERY stressful to their system. I would go ahead and fast her for 12 hours at a time, providing her water of course, and she should regain her appetite. Put down her kibble for 10 minutes, and pick it up until a few hours later. Make sure she has lots of stimulating play time (in your yard, if possible) but definitely don't overdo it. And, definitely she should see your vet for a check-up anyway, good luck with her!
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