My puppy is 13 weeks old and up until today she has eaten her dry puppy food, not much but now she won't eat nothing,, should I be worried

My puppy is 13weeks old ad won't eat anything, should I be worried

Let's get a bit more background:

Has she been vaccinated? Other than at the vet's office has she been around other dogs?

Is she drinking?

Is she going to the bathroom?

Has her behavior changed?

Have you caught her chewing on things that she could have swallowed?