I agree with your vet,,... most likelly she had a minor internal injury ... an xray may help but this tiny they will not have much to do besides wait untill she heals....
If she had internal bleeding or something that bad they would have noticed...
I would make sure to watch for signs of getting worse or not... if she is getting better and better that is good... if not then go back to the vets...
PS.: Puppies recover fast, you should see improvements withing days, i mean, a day is already a noticeably improvement , they also decline fast... so if things get worse get going....
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