I am in tears reading your post. What you have done/are doing is amazing. It isn't your fault for letting her eat a bagel or anything else. It is just this awful disease.
I was on cellcept for my kidneys and on prednisone at the same time. I don't know if the cellcept did anything for my UC but was told that it can help 25% of people with UC, it is a heavy hitter type of drug so not sure if it's recommended for anyone unless it has to be.
I am on remicade and about 80% to normal after 3 infusions. Sulfasalazine gave me kidney disease, Imuran makes me feel out of it and the remicade gave me a headache and nausea but goes away about a week after the infusion.
My heart goes out to you and your family.
Take care,
Beth