Hello, and thanks for writing in.
With her having an upset stomach, I would only give a small amount at a time, but more frequently than normal. So, I would recommend about 1 tablespoon at a time of the canned I/D food, but several times through the day/night, so it's easier on her stomach to digest.
A cat Rosie's size can eat about 1 - 1&1/2 cans of I/D food per day total.
You are very welcome - glad to be here to help out!