I agree with the fact that the best interests of the puppy are usually served by staying with Mom until 12 weeks, but in circumstances where the puppy needs to go to it's forever home sooner, the new mommy needs to be well versed in it's care, have an experienced person to bounce concerns off of over the telephone at any time of the day, and be prepared to be with the puppy 24/7, no leaving the puppy home alone for any period of time until at least 12 weeks and then for only very very short periods if it has to be.
The breeder should welcome your concern and honor the fact that you want what is best for her and the best start in life is to learn all she can in those important formative weeks when mom and littermates teach so much.
