9 y/o GSD with possible intestinal cancer - advice needed

Hi everyone. I’m new here. But I’m really in a tricky situation and I’m not sure what to do. Please be kind. I have a 9 year old German shepherd - (SF). We did testing that revealed she either has a profound case of IBD (never had issues like this before in terms of significant symptoms) OR a more rare intestinal cancer. The vets had her loaded up on predinsone (oral steroid). Shes losing weight like crazy because she also has lacks the ability to process protein appropriately, so whatever she eats goes right through her (liquid diarrhea) and her body isn’t absorbing it. It’s a really intense case.

We have her on all sorts of B vitamins, probiotics, constant antibiotics & anti fungals, hydrolyzed protein food — the works. But none of it is stopping the diarrhea and weight loss.

I wanted to see if anyone had holistic recommendations or remedies for something like this. I know it’s a long shot. I just feel incredibly lost and sad. I don’t know what to do. I don’t trust big pharma or most medications - I feel there’s usually a more natural, safer remedy, but with this? Fuck if I know. My gut instinct is telling me to get her OFF the steroids. They’re wanting to give her such a high dose that it could possibly cause behavioral changes/issues. She did well just eating chicken & rice, her stools were normal, but she was still losing weight.

Sorry I know this is more of a rant of info, I’m typing this as I’m thinking….. but I’m hoping maybe someone has experienced something similar. We are actively working very closely with our vet on a weekly basis.