PLEASE either find a way to get money to help this puppy. I hate to say it, but you should be terrified. She will die if this keeps up.
She is so young and tiny and these babies just don't have much reserve. They go down quickly.
You should call around and see if there is a vet in your area who might work with you on the cost. There is funding available with some vets. Someone just posted a link the other day......take a look at this:
Home
IF you decide that you want to reach out to a rescue, send an email to
yorkiehavenrescue06@yahoo.com and someone will contact you.
I will keep you and her in my thoughts and prayers.