Jack russell puppy with high liver values, and even higher after medication for a month?

Last month I took my Jack Russell puppy to the vet to be spayed at 6 months of age. They ran pre-op bloodwork and found the liver values were high, and did the more extensive liver tests for the bile acids. These were abnormal as well and she was put on Adenosyl for a month. This morning I took her back for the re-check to and be spayed this time. The pre-op labs were even higher this time. Now they're feeding her and going to recheck the bile acids again today. I was told if she ate something toxic or if it was anything environmental, the meds would have helped it, and that this sounds like it's more of a liver disease, possibly a shunt. They told me they were going to send these labs out to a special lab to be processed, and that we would need to see a specialist for possibly an abdominal ultrasound or liver biopsy. I have been researching liver shunts and sounds like surgery is the best option. Does anyone have experience with this with their jack russell? She has had no symptoms whatsoever, besides once in awhile loose stools and I noticed once her urine was dark. Besides that she has seemed very healthy, normal jack russell energy, and has been eating (only eats puppy Eukanuba, no human food) and drinking normally. She is like our child and I'm getting very upset with this news. Any advice??