I was supposed to get a pup from a breeder in my area tomorrow. However, she just went for her 7-week check up and has a heart murmur. The breeder basically gave me options, i can get another pup, or wait for a future litter.
Were you planning to bring the pup home tomorrow? Most especially because of her weight it would be best to leave her as long as possible with the mother unless I misread your post...
I hope everthing goes well and you have a beautiful healthy pup soon!