Hi. First response you will probably get from everyone here is:
Go to your vet! Is she drinking? Is her poop normal? What diet do you feed? No one can diagnose your baby but her vet but make sure she is not dehydrated.Do the tent test-pinch up the skin on the back of her neck- if the "tent" stays up for several seconds she is dehydrated. Hope all goes well with your baby, please keep us informed of her progress!