That was why I did as many tests as I did during Sammy's 14 day countdown. I wanted to learn (and share) what her body does naturally if not interfered with by me. I learned her BG goes up towards the top end of the range (115 ish for her) when she has not been fed for over 4 hours or so. Then I feed, and 2 hours later or so I tested. She was down in the 80's after she had processed the food. Very interesting, and useful in terms of evaluating her periodically over time.
I am going away on Saturday for 2 weeks and son Brian will be on cat duty. He has stated he is going to test, just to feel secure that she is ok, since he is not staying at the house with her. With this data I gathered, he will have something to compare to.