Im sure you will get lots of helpful advice coming along soon,but i would just say that your little pup is very young...too young really to have left her mum, so will need lots of extra attention.
Pleae don't let her go for long without eating or you could end up with a very poorly baby. At her age she should still really be playing with her siblings and snuggling up to her mum whenever she wants to, so i think you may have to spend more time with her, and be sure that she eats regularly, whatever it takes. Good luck, i hope she will soon settle into your routine.
