Until they get a diet for her, you might try sweet potatoes just to see if she likes them. The trick with the IBD is finding a protein they can eat/handle. My Cookie is on Tilapia and it has been fine for her. She is not doing so well right now ... she was in ICU for a week and her protein is still low and pancreatic enzymes elevated.
We see the specialist again tomorrow.
I really, really hope the Mirtazapine helps Holly. Please keep us posted. I am happy you updated...I have had Holly on my mind.
She and you are in my thoughts and prayers.