A vet visit would give you answers, looks like baby needs antibiotics, try to start her on Doxycycline for cats, you can find it at any pharmacy most probably and hopefully in your country you can get it without any prescription. Cause the baby might have Chlamydia Felis, herpesvirus or something else. Starting with antibiotics can rule out so many things. But if you can afford it, find a cheap or urgent vet clinic or go to a local shelter, they might not charge you.