I think that we determined the following.
1 - She drops fast and far on Novolin.
2 - She seems to follow the typical N curve. Early drop, short duration.
3 - She dropped about 150 points on a really tiny dose of N, and would have dropped farther if you hadn't been testing and caught the dip into the 50s.
4 - Continuing on Novolin, even at a tiny dose, is going to require close monitoring.
I think, after seeing this cycle, that you have two choices.
Continue with really small doses while testing, and even if you see a PS reading above 300, I wouldn't go higher than .5u per shot. Or....
Stop with the N, check at least twice a day for ketones using the urine test strips for ketones, and see the new vet on Saturday. Share all the numbers you have for Bear with them, the BG numbers, the urine glucose numbers and the dose amounts.
See what they think about switching to Lantus, or even what they think about whether insulin is needed. I think it might be, but I'm not a vet, and I can't run a blood panel. Make sure they understand that you were feeding low carb, and what you had to do to get her numbers up tonight with the karo and gravy and all.
Make sense?
Carl