Thanks everyone for the kind thoughts.

Sara finally came home yesterday. The vet felt that the biopsy pretty conclusively showed that the Rimadyl caused the trouble (and the good news from that is that Pfizer is paying for all the bills). Her bilirubin peaked at 24 last week, but had come down to 11 yesterday. BF has an medicine chest full of pills, injectable nausea medicines, and fluids to administer subcutaneously. The concerning part is that Sara's weaker and still not eating. So we're hopeful she'll recover from this, but it's going to take a while to know for sure.