Prednisolone question

Hi Everyone! My 4 year old cat has had very inconsistent diarrhea for about 3 years. I've tried many different foods over the years. Currently she's having soft serve poop about every 6 weeks. I've taken her to the vet multiple times and have discussed with three different doctors. I had her on prednisolone 1.25mg daily after reducing her down for about three months. Using the prednisolone is scary because I don't want her to get diabetes. One of the Vets was very against the steroid while the latest says she is not at risk. My question is: Can I give her a low dose of steroid once or twice a month every couple months or would that hurt her in some way? It seems ridiculous to give her steroids for weeks/months at a time when the soft stool resolved after one small dose of steroid. I spent a ton of time discussing with the Vet and while her stool has gotten more firm, she still has very soft stool every couple months. The Vet hasn't responded the last two times I left a message with this question.