i'm sympathetic to her health concerns (obviously) but the blog post is about type 1 and your girlfriend seems to have type 2. although they have similar names, their causes are unrelated.

from my perspective you are responding to a blog about the complications of a terrible, incurable illness with "you need more exercise" which has no impact on type 1.

for completeness: yes, diet and exercise does change the amount of insulin a type 1 diabetic needs, but it does not "get better" or "go away".

the type 1 diabetics i know actually live very healthy lives by necessity because they need to constantly keep track of their carb consumption so they can adjust the insulin amount.