It's possible that the sample was too small or she didn't take enough samples. Most vets opt to take a couple of samples from different areas. That's why doing a needle biopsy/ultrasound biopsy is not recommended. (I know your vet didn't do one of those).
Also, I would think that the biopsy would have showed cirrhosis or fibrosis if she had it, but again maybe that small sample wasn't enough?
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