Hi and welcome. You do have a beautiful family. Congratulations.
O.K., when my Sophia first came home she was having trouble with eating and had diarrhea. After many trials, I got her some Nutro puppy food in the can (green label.) It is so great. It has all the right ingredients for these puppies and she really loves it. She basically wouldn't eat anything else. It is not that expensive at all and the best part is you can get it at Petsmart.
Please consider trying this food. It really worked with my pup. Her diarrhea instantly went away.
I also highly recommend getting some Nutrical. The puppies love it and it really makes a big difference when they won't eat. They are at high risk for Hypoglycemia.
I also recommend taking her to a different vet. The initial exam just to make sure she is o.k. is usually only $30 or so (at least where I live.)
Best of luck and please keep us posted. I'm sure she will be fine. She just needs lots of tender loving care, and perhaps some doggie meds. (AND some Nutro puppy food!!)