After her final HIDA Scan she'll get to have a liver biopsy. Yipeee !!!
She'll also be visited by an opthomolagist sometime today to evaluate her for characteristics of Alagille syndrome. The majority of children with this syndrome have changes within the eye that should be evident at her age. Aliagille syndrome (while not a desired diagnosis) manages to explain a number of her issues -- Heart, Kidney, Liver, Metabolic Acidosis.
These three tests - the HIDA Scan, the Liver Biopsy, & the Opthalmic exam -- should help seperate out the two most likely candidates that are causing her liver problems.
It will be nice to just get a diagnosis so we can move on and figure out how to work with her issues.