Kidney Failu What might she Eat now ??

We guess that three year old Bandit got poisoned
around Christmas time, but we didn't notice her
kidney failure until about a month ago when she
got lethargic, and noticed a huge weight loss.
Right now it looks like life-long sub-q hydration
might be needed if she survives at all. A few
days ago, she was also diagnosed with a kidney
infection.

We're just trying to find something she'll (Bandit) will
eat. After first aid and hydration, she started
2 weeks ago with a voratious appetite for anything
wet, and has become progressively fussy.
We had to stop giving her the KD prescription diet cuz
she wasn't eating it. Now she's starting to turn her
nose up at tuna, her former favorite, and now we've found
some ocean brew she seems to like alright. But what
if she eventually refuses that too? Any suggestions?

Things do not look good. Not just a lack of improvement.