My 3 week old puppy has not poop in a day. I do wipe her bottom like as instructed to do after feelings what should I do? I'm worried about her!

This is worrisome.

First, why is this puppy not with the mother at 3 weeks of age? Is there a valid reason for this?

What are you feeding the puppy?

Have you gone to the vet? If so, what did the vet say?