What Nancy said! You are doing a great job. If the gods smile, it is possible that Rose's insulin will return to true normal, although most of us find that although the numbers improve, we never get beyond compensated IR; but the horses are clinically very well, and have some robustness to their systems (so that an accidental grass break-out doesn't send them over the edge into laminitis)

It is possible that Rose either doesn't need pergolide, or only needs it for 3 or 4 months during the seasonal rise. Tapering off, and then re-testing will tell the tale.   
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Jaini (BVSc),Merlin (over the bridge) ,Maggie,Gypsy

https://ecir.groups.io/g/CaseHistory/files/Jaini%20and%20Merlin-Maggie-Gypsy