Welcome to Just Answer. Colitis is inflammation of the interior of the colon. If it is bad enough it can cause bleeding. The drugs are meant to kill bacteria that cause the infection and inflammation of her digestive system. Stress and tension typically make any time of colitis worse. "Abnormal" stomach ultrasound could indicate anything, but chances that it is an ulcer are good. Blotches on the liver aren't necessarily anything to worry about, since it could be just fatty liver. Often just a good low fat diet and exercise are enough to take care of it over a few months. You are a good friend to want to help her. As her advocate you can go to appointments with her and ask lots of questions of her doctors. She may not think of some of the same questions you would, so this is a case where two heads are better than one.
Without actually seeing the test results it isn't possible to say what the diagnosis could be. Whenever the liver has any insult (even fatty deposits) some parts of it can become fibrotic (i.e. form scar tissue that isn't able to function as liver tissue). Luckily, we have far more liver tissue than we require, so minor fibrotic lesions are not life threatening. This diagnosis would be apart from the colitis and bleeding. While they were the scary things, the liver would be a long-term thing. With such a busy life, she will need to learn to pace herself, and practice some stress-reduction techniques.