Diagnosis and treatment for Olivia

Our 3 year old girl has become unexpectedly sick. We have no idea what is wrong with her and things seem to be just going down hill.  She's an indoor cat and has always been perfectly healthy, but all of a sudden she wasn't eating, moving and had a temperature of almost 41C. Our only option was to find an emergency vet and deal with the costs later. She was placed on drips for 24 hours and given an antibiotic called Metrobactin. Out bill reached just over £600 for a drip, medication and day/night stay. The only test preformed was for dehydration at a cost of £100. They discharged her because we were unable to provide further costs of the treatment with a high temperature of almost 40C. We have tried all the vets possible, but even charity vets required benefits criteria (which we dont fit). 

Since then, she had made some recovery as she was still on antibiotics. Our poor baby has now quickly declined and we urgently need to find care for her as she's suddenly draining puss mixed with blood in excessive amounts and has a rock hard stomach. We have tried everything we can and need your help. We don't want to put her to sleep. 

This is the last thing I want to do, but I have no other choice. We do not know how much the cost of everything will be, but taking into account the previous bill is why we set the donation to £1000. We dont have to reach that goal. Please if you can spare anything at all towards Olivia be will be forever grateful. Help us help out poor girl.  

I will provide all updates onto here. Stay with us and thank you greatly in advance.