Good luck to you. She seems to be holding on so what you're doing seems to be working. Hopefully, she just is too small to suck or to fight the other puppies for a space. Some TLC may be just the thing. Sounds like you are doing all the right things!
Thanks, thats what the vet said, we're doing all we can. The girl got up every 3 hours through the night to feed it.
The other runt seems to be doing OK. The momma doesnt push him away. She pushes away the little bitty one. It's sad really.
The good news is the other 6 are monsters and growing fast.