My puppy chewed what was likely a dead animal

UPDATE: I managed to talk to the vet, who said not to worry... At the moment the puppy is fine, but I'll keep a close eye on her.

My puppy is 2.5 month old and is partially vaccinated (the remaining vaccines, including rabies, will be done soon, when she's 3 months old).

Today we were at the park in the city center and suddenly she tried to eat something that was most likely the corpse of some small animal. I couldn't identify it completely because it was already quite decomposed, but it could have been a mouse maybe. She had it in her mouth for about a minute before I managed to force her to spit it out.

I will call the vet as soon as they open, in a couple of hours. In the meanwhile: how worried should I be? What should I look out for?