Her body has to learn what to do with the insulin, so the numbers will move around for awhile. We went thru the same thing. They're going thru so many changes that it throws their whole system off. Goof's numbers started to decline and level off after about 6 weeks, just as our vet said they would. He told us right from the beginning that the first month to 6 weeks is a roller coaster that isn't any fun, but then it starts getting better.
I see Sony was diagnosed on 2/15 so you're at the one month mark, you'll probably start to see gradule decline in the numbers starting soon. Our vet also recommends that with ProZinc, that the dosage be adjusted by 1/2 units, whether you're going up or down with the dose and to wait at least a few days before adjusting it.