As one of the most experienced and long-term members here, I’d like to toss in my two cents worth.
First, I’d take the dose back down to 4.25u and allow her to have six cycles at that dose. Doses should only be raised when you know how low the dose it taking her and when a fur shot is not potentially in the mix. If after six consecutive cycles in which you have enough data and you see no or only one yellow nadir, increase by 0.5u. Rushing doses doesn’t help her. I understand you are concerned about work on Monday but it’s doubtful you would have seen an enormous drop into green on the first day of a dose increase.
Second, while her dose on Vetsulin did get high, you weren’t testing enough to know how low it was taking her. I’ve seen cats go from 300 to 40 and back to 300 and if the CG did not have the midcycle test, it would have looked like the cat was just high. With very few midcycle tests on Vestulin, we don’t know whether you missed a good dose. And Vetsulin is a much harsher insulin than Lantus and had more potential to drop her suddenly.
My gut tells me she will likely need more insulin but my knowledge and experience require I advise that you shouldn’t chase numbers. The TR protocol was designed to be a bit more aggressive so by increasing her after only two shots at 4.25u, one of which you thought might be a fur shot, you are pushing outside the safety mechanisms designed within the TR protocol.
Please continue to test her ketones daily and stick with the TR protocol and not a rendition of it. She’s not to the point where you need to think about custom dosing.