I highly recommend taking her to UT's vet hospital, they are by far the best in the nation for liver shunts. Hands down. She will need an ultrasound and scintigraphy done as well before surgery to see if it is indeed a shunt (or microvascular dysplasia - which is not operable), and to see if its localized for surgery. In the mean time, she needs to be eating Royal Canin LS 14 (which is a very low protein prescription diet) and taking Lactulose (prescription your vet can write and you can get it at Rite Aid, Target, etc and its on the $4 program) regularly to keep the toxins flushed from her body. If $$ is an issue and you seriously do not want to give her up, then I suggest you get CareCredit (its a credit card for medical emergencies and you have months to pay it off). If its a shunt, you will be looking at around 2000 in bills. If its MVD, sometimes they still need to do surgery to verify that it is NOT a shunt (if the tests are not completely clear) and even if they don't repair anything, it will still be 1500ish for everything. My Ginger had surgery and she did not end up having a shunt even though her bile acids were over 100. Have you had a bile acids test? What were her pre and post numbers? Please keep us updated and feel free to PM me and ask any questions.
Here is a group on yahoo with others with babies with liver shunts/MVD... there is a HUGE amount information here... Please utilize this priceless resource.
Liver_Shunt_And_MVD_Support : Liver Shunt & MVD/HMD Support