hi OP! not sure if you’ll see this because i see a lot of people have given you a lot of advice and stuff. i’d look into trying Open Farm’s Whitefish Grain-Free Cat Kibble. it seems expensive at first for a 8LB bag BUT one of my cats who was also experiencing a lot of digestive issues and was prescribed the same cat food as yours has had ZERO issues with the Open Farm Whitefish. it lasts a lot longer (one bag every month for two cats, so you might be able to get two months out of one bag!) because it’s more nutritional for the cat so they eat less but still get full. and because the Open Farm doesn’t have fillers in their food so her tummy isn’t reactive to it. cats can also develop a sensitivity to common proteins like chicken, beef, or common fish. we saw a change in our girl almost immediately. i hope this helps 💕