@RedPandaExpress88 You are a great friend to be concerned about her and her wellbeing. I don't have or know anyone with UC but from personal experience my mother got diagnosed with cancer when I was 12. The first month I was so distraught that I could not be confronted just like its seems your friend is at the moment. I know that its so frustating but this is a natural reaction to getting bad news. For me during that time was a friend of mine that said to me that I can't change the diagnosis or know what to do but even though things are changing in your home life, our friendship is not going to change. I will still be there for whenever you need it, you can call me and we are still going to have fun together like going to the movies and shopping. It really helped me knowing that there was some stability in my crazy world.
Know she doesn't mean to make you feel terrible rather she is overwhelmed and distressed. This will pass.
Secondly you are a fantastic friend and someone I would wish would be there for me if I had problems in my life.
My only sugguestion would be to kept up send her message every now and again casually saying I hope you are having a okay day today. Thinking of you and I am a message away if you need me. Also maybe setting up a time to go out or if she is not well enough to do something together where she is like a coffee, playing some music together, a movie night.
You are amazing and don't forget that
Take care