Girlfriend needs your help!

I'm going to tell the whole story first.  
Four months ago my girlfriend was living a normal life, no problems, eating what she wanted.  Then she started to get a pain in her right breast.  And there was a hard lump there.  They checked it out and found it not to be cancerous but is was fairly large and needed to be taken out.  So she got a lumpectomy.  They took even more out than expected and she was in a lot of pain afterwards.  With all the medicine, depression, etc she could not eat.  She was never hungry and even when she did eat she would throw up.  But we figured this was normal and would just pass.  But it never did, she was losing weight rapidly, and still couldnt eat weeks later.
After a few trips to the doctor they wanted to find out what was wrong.  Apparently her immune system was so effected by the lack of food that she developed Ulcerative Colitis.  So now she is healed from the lumpectomy, but she has UC.  And still has not eaten in months.  She just keeps getting worse.  They are trying medicines but the problem remains that she cannot eat.  And to top it off, she just got a UTI.
So in the last four months she went from a normal life to a lumpectomy, fevers, anemia, UC, UTI, etc.  She is 5'4" and has went from 125lbs to 95lbs.  I am really starting to worry.
Does anyone have any advice how we can get her to eat?  She just can't keep anything down.  She has tried but nothing stays down.  And to make it worse now she doesn't want to drink because the UTI.  It hurts when she pees.