My puppy is sick, won't eat, vomiting, diarrhea. Can't afford vet.

I'm sorry to hear that Gizmo is so sick! Unfortunately, these symptoms are very worrying. Lethargy, loss of appetite, vomiting and diarrhea are often caused by a serious illness such as parvo, and can be life-threatening in a puppy this age.

I know that costs are a concern for you, but Gizmo really needs to see a vet right away - I would be worried that she may not survive without veterinary care. This doesn't necessarily need to be an expensive visit; if you let the vet know that you have financial constraints, they can often come up with a fairly inexpensive plan for supportive care (including IV fluids and injectable meds for you to give at home) that will give her a fighting chance even with a serious illness like this. You could also see if there is a low-cost SPCA clinic in your area that could help, or apply online for Care Credit, which is a payment plan accepted by most vet clinics: www.carecredit.com

If going to the vet is not possible at all, then I would just try to keep her warm and comfortable and do the best you can to keep her hydrated. You can continue giving Pedialyte if she's able to keep it down, and you might also try offering her some warmed low-sodium chicken or beef broth to help encourage her to drink. Plain boiled chicken or chicken-flavored baby food can also be offered if she's interested in eating at all, as these are very bland and should not upset her stomach further.