This is even more confusing as your description makes it sound like hepatic steatosis (fatty infiltration of the liver) and should be easily separated from cancer by the studies already done.
Unless she is trying for some trial medications or has some indecisive Drs involved I'm not sure what the delay is over. I will also say I have seen some Drs get hung up on something and require what others consider extreme proof before making a decision.
I'm sorry this is dragging out for you and her.