Here is a list of possible causes. I pray it is not any of them. Do know that as soon as I read this post I began to pray for her. I prayed for you too. Hang in there.
Causes of hepatomegaly may include:
Alcohol use
Congestive heart failure
Glycogen storage disease
Hemolytic-uremic syndrome (HUS)
Hepatitis A
Hepatitis B
Hepatocellular carcinoma
Hereditary fructose intolerance
Infectious mononucleosis
Leukemia
Neuroblastoma
Niemann-Pick disease
Primary biliary cirrhosis
Reye syndrome
Sarcoidosis
Sclerosing cholangitis
Steatosis (fat in the liver from metabolic problems such as diabetes, obesity, and high triglycerides)
Tumor metastases