yesterday, you thought your pup was depressed, today you believe her to be anemic and she needs to be put down. i think that you may be expecting a bit much from your pup.
she is 8 weeks old, an infant, and WILL sleep all the time. also, don't expect that she'll know how to walk right away either. especailly if you are putting her on a leash - she needs to be TRAINED to walk correctly on a leash, they do not come pre-taught.
if her poop is not runny, if she is eating, if she is drinking - my assessment is that she is fine with the exception of the worms she came with. go back to the vet and get her meds, and she should be fine.
may i ask you WHY you think she's anemic and needs to be put down???? please get a new vet if this is what your current one is telling you.