I believe its not that she is diabetic or not that she doesn't want to have any kids. like she stated  " I knew of course that type 1 diabetics did have kids" what she means by that is that she kind of knew that there was a diabetics that had kids and she also says that they could but it would be hard. At the moment she is too focused on her career and she doesn't want anyone getting in her way. she doesn't want to repeat the same story as her own mother did. leaving them in the house by themselves with an alcoholic father.