Here is the info about VSL#3 for IBD in Humans.
VSL#3 - The probiotic medical food for the dietary management of ulcerative colitis or an ileal pouch.
I would suggest speaking with your Vet about giving this to Ava.
It is working very well for TJ who has IBD. The folks on my yahoo group for Liver Disease Dogs give this to them as well, as it helps to rid the bad bacteria.
I just ordered a new box. If you and your Vet feel it is worth a shot, I will mail you a packet to try out. You are in NJ and me in NY, so you would get it rather quickly...Just let me know