Possibly not. There's seems to be quite a bit of misinformation in the media. The reports of glucose tablets are a complete red herring.
I've just read what DA herself said and I believe her, because it's exactly what happened to me a few years ago.
Type 1 and Type 2 diabetes are treated completely differently. T1s produce no insulin at all, so they have to be very careful about their insulin/food balance, which is why they're always testing. It wouldn't surprise me if Theresa May has an insulin pump, which delivers insulin automatically.
T2 diabetics produce insulin, but not enough. It's usually linked with insulin resistance, which means that the insulin which is produced doesn't work properly to get glucose to the brain and muscles where it's needed.
I don't fully understand the mechanism, but other hormones such as cortisol and adrenaline are involved. Both are produced in response to stress and block the action of insulin. This means that glucose can't work properly and stays in the blood stream. That's why immediate symptoms of too much glucose/insulin resistance are extreme tiredness and the brain not working properly.
DA probably does have aides to keep an eye on her health, but they might not have realised what they needed to do. Apparently, DA is a workaholic and it's very easy to keep going and not even to admit to yourself that you feel rough. With T2, the symptoms are likely to come on slowly, so it might not be obvious what was happening.
The most important thing is to keep food, medication and lifestyle under control. From experience, letting go causes problems. After nearly 30 years, the control needed is still hard and flies out of the window when I'm busy or stressed.