Hi
@CarolFrancis2018 and welcome to the forums.
I'm not on it myself and as far as I know it's more commonly used for T2s. But if you've got insulin resistance
then I'm guessing that that might be why they think you are a good candidate (aside from the obvious fact that it's recommended to help with heart and kidney issues).
As regards reducing the insulin, I'm guessing she reckons it will reduce your blood sugars and so wants you to start on a lower dose, which presumably you can then increase if you find it isn't enough?
The only specific T1 downside I can see from the description is that you'll need to watch out for DKAs, which is probably why she's told you to stop taking it if you are ill.
Would you like me to change the title of your thread so that it reads dapaglifloxin instead of dapa?