Wishing you the best.
After all that has been done though, I too am really shocked that your Vet opened her up for a liver biopsy and didn't even do a BAT first (very odd since you say he has liver disease experience). And during this, did you Vet look to see if he could see a shunt?
Although I have no idea, I doubt she has an intrahepatic shunt, as they are really more common in larger breed dogs. She could very well have MVD though.
I would insist on the BAT and I would get a referral for a Specialist at this point.
