If she is on 3 immunosuppressants, I think she is on 2 too many. My GI doctor took me off the 6MP two weeks prior to starting Remicade. In his opinion, it is far too risky.
At this stage, even though it is hard to face, I think surgery is her best option.
J-pouch wasn't an option for me. I was 63 at the time of my operation and considered too high a risk by my surgeon because of other health issues and being prednisone dependent for two years prior. I suffered with UP for twelve years and ran the gamut of meds. I have a "bag", but believe me, life is sooooo much better now. I can make plans, go places and do things that I was unable to do before surgery.
The best to your daughter. I will keep her in my prayers.