I'm sorry to hear Eva is so unwell at such a young age. My concern is that at 9 weeks of age, she likely has very low body fat reserves and will be prone to dehydration, low blood sugar and hypothermia. It is possible her antibody levels are low, meaning she is not equipped to fight off infections. For many pups, at time of re-homing their stress levels rise, again opening them up to infection.
If she is not showing response to the medication given and is continuing to deteriorate, I would recommend bringing her back to the veterinary clinic. This is important because unwell puppies can go downhill so quickly and they can even pass away from infections at this age.
At the re-check, the vet will ensure that dehydration has not started to set in, as if it has, she will need to be admitted to the hospital for some intravenous fluids. Typically, sugars and salts are added to the drip if she needs them. IV antibiotics will also be added if she is not eating oral medication.
Another reason a hospital admit would be a good idea is that f her oxygen levels are low, she may benefit from some oxygen therapy, while if her temperature is low she can be actively warmed.
Some puppies will benefit from feeding tubes, while other takes well to syringe feeding. Puppies her age need to eat about every 6-8 hours or so to maintain normal blood sugar levels, so if she is not doing this, she will likely need some assisted feeding. Low blood sugar can cause tremors, seizures and even death.
While nursing at home is possible, if she is no eating or drinking, this can be very difficult. It takes a lot of commitment and an experienced owner.
Many puppies with chest infections will develop fevers, nausea and lethargy; all of which reduce appetite. There are some medications available which can help counteract these symptoms.
I have my fingers crossed for your little one and am wishing Eva a speedy recovery.
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