I wish we could get her and that 3 week old puppy in another thread together. I am afraid it still needs to be nursing.
Just how long has it been since the accidental mating you mentioned in the other question? Unless more than 63 days, there is some chance it is a real pregnancy and she is about to whelp. If so, you need to do some serious digging. I would start at
Woodhaven Labradors Articles Your library should have books too.
Once she settles down and the vet will do it, please have her spayed. I don't know about where your are, but here we have a terrible problem with too many dogs, and ill prepared people continuing to breed more. There is material at the link above that I wish everybody considering breeding would read. In discussing the hassles of keeping an intact female, perhaps I should say more about phantom pregnancies. They can drag on only leaving a few months before the flaky behavior leading up the next season starts.
Perhaps a vet visit is in order. It would lay aside any worries about a real pregnancy. It could turn up a physical problem. My guess is that she just needs a little more time, but that is just a guess. It won't be the first time somebody brought in a sulky dog with nothing wrong.