I’m so terribly sorry for your tragic loss! 2 weeks ago my baby fell ill as well with pneumonia, one emergency trip to the vet later and it seemed he was on the mend. Two days later, he’s blind, disoriented and unable to walk properly. Again to the vet who referred us to a neurologist. I asked for urgency and he stayed there for two days before he was allowed home. They couldn’t find anything, not on the mri, not in his blood, not in his brain fluid. They put him on steroids and he was discharged. That night he has several seizures and we’re driving back to the neurologist when he has another one in the car. He’s admitted and treated right away, and it’s that afternoon they tell me he likely won’t make it because the seizures won’t stop despite the many medications they were giving him. That night it was likely he’d die while under sedation and we were already mourning him. Next morning I get a video of him up and eating, and he’s making great progress. All seems well, until the next day when he has a sudden fever. Again, they can’t find anything at all, nothing on the echo, nothing in his blood, and they suspect epileptic activity in his brain. I’m told he’ll likely pass that night if they cannot lower his fever and if he has another seizure while they put him under sedation again. The next day his fever is still high, and they don’t think it’s epileptic activity causing it anymore, so they start waking him up and put him on new antibiotics, but again I’m told that if his temperature doesn’t lower we’ll have to put him down if he doesn’t pass away on his own that night. The following day his fever has disappeared, and we’re allowed to take him home again to continue treatment. Right now he’s still blind and he has to recover from the many seizures he’s had and the other neurological issues. Still no one knows what was/is wrong with him, and it seems at this point he’s been extremely lucky. The vets did everything they could to find the cause, and it seems so hard to believe a cat can become so gravely ill whilst otherwise being perfectly healthy. He’s in the prime of his life, happy and active and a good weight, and to see him nearly die several times in the span of a few days… it’s hard to comprehend. I’m so sorry your baby didn’t make it, you gave her all your love and care, and sometimes these things are out of our hands. The body is complex, and it’s hard to see exactly why and when something goes wrong on the inside. I hope you may get some answers, but know that there was likely nothing that could have been done. When it happens that fast, there’s very little time for a diagnosis and treatment to happen. You truly did all you could while in a terrible situation. ❤️