Without examining Potchi, I cannot cannot confirm whether or not she has a fever; rapid breathing and shivering may be due to a variety of different conditions including infections, trauma, pain among others. You should keep an eye on her, but due to her young age I would recommend visiting your Veterinarian for an examination to be on the safe side. Regards Dr Callum Turner DVM
The Russian blue is a sweet-tempered, loyal cat who will follow her owner everywhere, so don't be surprised if she greets you at the front door! While she has a tendency to attach to one pet parent in particular, she demonstrates affection with her whole family and demands it in return. It's said that Russian blues train their owners rather than the owners training them, a legend that's been proven true time and again.