My 6 year old cat has signs of FIP but I dont understand how she would have contracted it? She is completely indoors and is the only cat in the house. She was vaccinated every year since a kitten up until 2 years ago. I have tapped her stomach and got yellowish mucusy fluid and she isnt eating at all and very lethargic. I have been giving her B12 injections, SQ fluids and also giving her prednisolone and clavamox orally. Im not sure yet if she has FIP or Liver Diease but would it be bad or beneficial to give her Liver 7 injection?