It is most likely liver problem, not GB. I woudn't do the Liver flush.
There is something else there. I believe it is her liver that makes her tummy swolen. Also, her body may not like milk.
I would recommend you to check the blood and liver for problems.
If everythins looks clear, change her diet and find the foods that stimulate
the liver.
How long has she been having the problem? Is her skin yellowish?