Your description of your sister is very similar to something I've experienced. About 10 years ago I became horribly jaundice with liver enzymes through the roof and everything else. Ten years ago they had no idea what it was, and chalked it up to me being pregnant. I saw many many doctors through the years and have more then my fair share of autoimmune diseases including: type 1 diabetes, auto immune hemolytic anemia, ITP, lupus. To this day my liver has not yet normalized but I am seeing a new doc to try to determine exactly what is happening. I have had two liver biopsies, two bone marrow biopsies and many scans and ultra sounds. Although my health history is rather extensive they have yet to pinpoint what is happening with my liver. They have suggested the scarring in my liver, shown by the biopsies may be caused by the lupus or may be caused by autoimmune hepatitis but nothing has been diagnosed as of yet.
I wish your sister the best of luck in finding what is happening.
Diabeties is a serious disease that compromises a person's natural defense system allowing other diseases to cause additional harm and complications. There are several cases similar to your sister's condition on the web which indicate that she is most likely suffering from gastrointestinal problems associated with the diabetes. It appears that GI problems in diabetes are quite common but rarely properly diagnosed. Additionally it would seem that the duration of diabetes and the degree of glycemic control drive the intensity of GI issues and that any part or all of the GI tract can be affected i.e. mouth, esophagus, stomach, small intestine, colon, liver, and pancreas. Finally, managing GI problems in diabetics must start with obtaining appropriate laboratory, radio-graphic, and GI testing followed by pharmacological therapy, glycemic control and a strict dietary plan. The following links may help:
http://www.*****************/gastroenterology/forums/backup/topic-46688.html
http://journal.diabetes.org/clinicaldiabetes/V18N42000/pg148.htm
Best Wishes
Billy