Ahh poor Trixie I feel so bad for her. Izzy also has pancreatitis/SIBO/IBD and we spent a fortune on vet bills since last November and tried many RX foods such as Scient Diet W/D, ID (but don't ever use the ID since that has pork in it and that put Izzy back in the hospital for 3 days after 3 weeks of being on the ID).
She is now on the Purina EN (can) and Purina HA (kibble) I only give h er the EN in the am/pm so that I can put her supplements on it. She free feeds on the HA all day.
She is also on Tylan powder for her SIBO/IBD.
Trust me as much as I hated to put her on commercial food (she was fed freeze dried RAW - The Honest Kitchen) and nothing commercial..this is what is keeping her alive so I bit the bullet and did what I had to do for her. So far - so good.
Keep us posted on Trixie please.
Oh and 8 months of vets and foods she has been symptom free for 30 days now which is amazing.