And that is fine but better to be able to get 2 cycles that are similar than having one where BG is higher than it would be with a full dose. A lot if not most cats go lower at night so when you get a lower AMPS given that Novolin sometimes doesn't last a full 12 hours, it makes me wonder just how low BG might have gone during the night. Try the lower dose and if possible, set an alarm for around +5 or +6 during the night to see if you can catch her night nadir along with the usual before bed test.