Support Tonks' vet bills

My six year old calico cat, Nymphadora, akaTonks, is currently at the vet. On Tuesday, October 20, i came home finding Tonks near her uneaten food with her head tucked in the corner of the wall. She was disoriented, dehydrated, and not vocal, which is odd for her. I took her to the Pueblo Area Emergency Vet where she stayed over night. In the morning I was advised to take her to the Sothern Colorado Internal Veterinary clinic. Sadly, they have informed me that they are unsure what is wrong with her.

The vet has run
- xrays, which showed she had one kidney smaller than the other but they ruled that out as being the cause;
-blood work which showed a drop in her potassium levels, but, other wise unremarkable;
-her heart rate and temperature are all within normal range.

Today they will do an ultrasound and addition blood work. She currently is mostly unresponsive and shows no interest in eating. She hardly lifts her head.

I was blessed with Tonks on my first christmas in colorado in 2009. She was born at Triple Acres Horse Rescue and since the day she arrived she has been sharing her voice and friendship with me. She is a food motivated cat who can learn most tricks quickly as long as it doesn't involve silence.

Any support you can give to aid in Tonks' recovery would be greatly appreciated. Sadly the vet bills have drained my savings and I fear that additional expenses will limit that care she is able to recieve.